By Eric Tate and Christopher Emrich
Disasters stemming from hazards like floods, wildfires, and disease often garner attention because of their extreme conditions and heavy societal impacts. Although the nature of the damage may vary, major disasters are alike in that socially vulnerable populations often experience the worst repercussions. For example, we saw this following Hurricanes Katrina and Harvey, each of which generated widespread physical damage and outsized impacts to low-income and minority survivors.
Mapping Social Vulnerability<p>Figure 1a is a typical map of social vulnerability across the United States at the census tract level based on the Social Vulnerability Index (SoVI) algorithm of <a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/1540-6237.8402002" target="_blank"><em>Cutter et al.</em></a> . Spatial representation of the index depicts high social vulnerability regionally in the Southwest, upper Great Plains, eastern Oklahoma, southern Texas, and southern Appalachia, among other places. With such a map, users can focus attention on select places and identify population characteristics associated with elevated vulnerabilities.</p>
Fig. 1. (a) Social vulnerability across the United States at the census tract scale is mapped here following the Social Vulnerability Index (SoVI). Red and pink hues indicate high social vulnerability. (b) This bivariate map depicts social vulnerability (blue hues) and annualized per capita hazard losses (pink hues) for U.S. counties from 2010 to 2019.<p>Many current indexes in the United States and abroad are direct or conceptual offshoots of SoVI, which has been widely replicated [e.g., <a href="https://link.springer.com/article/10.1007/s13753-016-0090-9" target="_blank"><em>de Loyola Hummell et al.</em></a>, 2016]. The U.S. Centers for Disease Control and Prevention (CDC) <a href="https://www.atsdr.cdc.gov/placeandhealth/svi/index.html" target="_blank">has also developed</a> a commonly used social vulnerability index intended to help local officials identify communities that may need support before, during, and after disasters.</p><p>The first modeling and mapping efforts, starting around the mid-2000s, largely focused on describing spatial distributions of social vulnerability at varying geographic scales. Over time, research in this area came to emphasize spatial comparisons between social vulnerability and physical hazards [<a href="https://doi.org/10.1007/s11069-009-9376-1" target="_blank"><em>Wood et al.</em></a>, 2010], modeling population dynamics following disasters [<a href="https://link.springer.com/article/10.1007%2Fs11111-008-0072-y" target="_blank" rel="noopener noreferrer"><em>Myers et al.</em></a>, 2008], and quantifying the robustness of social vulnerability measures [<a href="https://doi.org/10.1007/s11069-012-0152-2" target="_blank" rel="noopener noreferrer"><em>Tate</em></a>, 2012].</p><p>More recent work is beginning to dissolve barriers between social vulnerability and environmental justice scholarship [<a href="https://doi.org/10.2105/AJPH.2018.304846" target="_blank" rel="noopener noreferrer"><em>Chakraborty et al.</em></a>, 2019], which has traditionally focused on root causes of exposure to pollution hazards. Another prominent new research direction involves deeper interrogation of social vulnerability drivers in specific hazard contexts and disaster phases (e.g., before, during, after). Such work has revealed that interactions among drivers are important, but existing case studies are ill suited to guiding development of new indicators [<a href="https://doi.org/10.1016/j.ijdrr.2015.09.013" target="_blank" rel="noopener noreferrer"><em>Rufat et al.</em></a>, 2015].</p><p>Advances in geostatistical analyses have enabled researchers to characterize interactions more accurately among social vulnerability and hazard outcomes. Figure 1b depicts social vulnerability and annualized per capita hazard losses for U.S. counties from 2010 to 2019, facilitating visualization of the spatial coincidence of pre‑event susceptibilities and hazard impacts. Places ranked high in both dimensions may be priority locations for management interventions. Further, such analysis provides invaluable comparisons between places as well as information summarizing state and regional conditions.</p><p>In Figure 2, we take the analysis of interactions a step further, dividing counties into two categories: those experiencing annual per capita losses above or below the national average from 2010 to 2019. The differences among individual race, ethnicity, and poverty variables between the two county groups are small. But expressing race together with poverty (poverty attenuated by race) produces quite different results: Counties with high hazard losses have higher percentages of both impoverished Black populations and impoverished white populations than counties with low hazard losses. These county differences are most pronounced for impoverished Black populations.</p>
Fig. 2. Differences in population percentages between counties experiencing annual per capita losses above or below the national average from 2010 to 2019 for individual and compound social vulnerability indicators (race and poverty).<p>Our current work focuses on social vulnerability to floods using geostatistical modeling and mapping. The research directions are twofold. The first is to develop hazard-specific indicators of social vulnerability to aid in mitigation planning [<a href="https://doi.org/10.1007/s11069-020-04470-2" target="_blank" rel="noopener noreferrer"><em>Tate et al.</em></a>, 2021]. Because natural hazards differ in their innate characteristics (e.g., rate of onset, spatial extent), causal processes (e.g., urbanization, meteorology), and programmatic responses by government, manifestations of social vulnerability vary across hazards.</p><p>The second is to assess the degree to which socially vulnerable populations benefit from the leading disaster recovery programs [<a href="https://doi.org/10.1080/17477891.2019.1675578" target="_blank" rel="noopener noreferrer"><em>Emrich et al.</em></a>, 2020], such as the Federal Emergency Management Agency's (FEMA) <a href="https://www.fema.gov/individual-disaster-assistance" target="_blank" rel="noopener noreferrer">Individual Assistance</a> program and the U.S. Department of Housing and Urban Development's Community Development Block Grant (CDBG) <a href="https://www.hudexchange.info/programs/cdbg-dr/" target="_blank" rel="noopener noreferrer">Disaster Recovery</a> program. Both research directions posit social vulnerability indicators as potential measures of social equity.</p>
Social Vulnerability as a Measure of Equity<p>Given their focus on social marginalization and economic barriers, social vulnerability indicators are attracting growing scientific interest as measures of inequity resulting from disasters. Indeed, social vulnerability and inequity are related concepts. Social vulnerability research explores the differential susceptibilities and capacities of disaster-affected populations, whereas social equity analyses tend to focus on population disparities in the allocation of resources for hazard mitigation and disaster recovery. Interventions with an equity focus emphasize full and equal resource access for all people with unmet disaster needs.</p><p>Yet newer studies of inequity in disaster programs have documented troubling disparities in income, race, and home ownership among those who <a href="https://eos.org/articles/equity-concerns-raised-in-federal-flood-property-buyouts" target="_blank">participate in flood buyout programs</a>, are <a href="https://www.eenews.net/stories/1063477407" target="_blank" rel="noopener noreferrer">eligible for postdisaster loans</a>, receive short-term recovery assistance [<a href="https://doi.org/10.1016/j.ijdrr.2020.102010" target="_blank" rel="noopener noreferrer"><em>Drakes et al.</em></a>, 2021], and have <a href="https://www.texastribune.org/2020/08/25/texas-natural-disasters--mental-health/" target="_blank" rel="noopener noreferrer">access to mental health services</a>. For example, a recent analysis of federal flood buyouts found racial privilege to be infused at multiple program stages and geographic scales, resulting in resources that disproportionately benefit whiter and more urban counties and neighborhoods [<a href="https://doi.org/10.1177/2378023120905439" target="_blank" rel="noopener noreferrer"><em>Elliott et al.</em></a>, 2020].</p><p>Investments in disaster risk reduction are largely prioritized on the basis of hazard modeling, historical impacts, and economic risk. Social equity, meanwhile, has been far less integrated into the considerations of public agencies for hazard and disaster management. But this situation may be beginning to shift. Following the adage of "what gets measured gets managed," social equity metrics are increasingly being inserted into disaster management.</p><p>At the national level, FEMA has <a href="https://www.fema.gov/news-release/20200220/fema-releases-affordability-framework-national-flood-insurance-program" target="_blank">developed options</a> to increase the affordability of flood insurance [Federal Emergency Management Agency, 2018]. At the subnational scale, Puerto Rico has integrated social vulnerability into its CDBG Mitigation Action Plan, expanding its considerations of risk beyond only economic factors. At the local level, Harris County, Texas, has begun using social vulnerability indicators alongside traditional measures of flood risk to introduce equity into the prioritization of flood mitigation projects [<a href="https://www.hcfcd.org/Portals/62/Resilience/Bond-Program/Prioritization-Framework/final_prioritization-framework-report_20190827.pdf?ver=2019-09-19-092535-743" target="_blank" rel="noopener noreferrer"><em>Harris County Flood Control District</em></a>, 2019].</p><p>Unfortunately, many existing measures of disaster equity fall short. They may be unidimensional, using single indicators such as income in places where underlying vulnerability processes suggest that a multidimensional measure like racialized poverty (Figure 2) would be more valid. And criteria presumed to be objective and neutral for determining resource allocation, such as economic loss and cost-benefit ratios, prioritize asset value over social equity. For example, following the <a href="http://www.cedar-rapids.org/discover_cedar_rapids/flood_of_2008/2008_flood_facts.php" target="_blank" rel="noopener noreferrer">2008 flooding</a> in Cedar Rapids, Iowa, cost-benefit criteria supported new flood protections for the city's central business district on the east side of the Cedar River but not for vulnerable populations and workforce housing on the west side.</p><p>Furthermore, many equity measures are aspatial or ahistorical, even though the roots of marginalization may lie in systemic and spatially explicit processes that originated long ago like redlining and urban renewal. More research is thus needed to understand which measures are most suitable for which social equity analyses.</p>
Challenges for Disaster Equity Analysis<p>Across studies that quantify, map, and analyze social vulnerability to natural hazards, modelers have faced recurrent measurement challenges, many of which also apply in measuring disaster equity (Table 1). The first is clearly establishing the purpose of an equity analysis by defining characteristics such as the end user and intended use, the type of hazard, and the disaster stage (i.e., mitigation, response, or recovery). Analyses using generalized indicators like the CDC Social Vulnerability Index may be appropriate for identifying broad areas of concern, whereas more detailed analyses are ideal for high-stakes decisions about budget allocations and project prioritization.</p>
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By T. V. Padma
Studies increasingly point to the presence of pharmaceutical and personal care products in urban stretches along the Ganges River, which originates pristine in the Himalayas but is heavily polluted with industrial effluents and domestic sewage when it empties into the Bay of Bengal.
Paucity of Studies<p>There are few studies on PPCPs in Indian rivers. "Such studies are expensive, as they require sophisticated instruments," Suthar explained.</p><p>"Sewage, treated or untreated, flowing into the rivers is the main polluter," said <a href="https://manipal.pure.elsevier.com/en/persons/balakrishna-keshava" target="_blank">Keshava Balakrishna</a>, a professor in the Department of Civil Engineering, Manipal Institute of Technology. Sewage and effluent have <a href="https://eos.org/articles/drugs-in-our-water-can-leave-even-more-toxic-by-products" target="_blank" rel="noopener noreferrer">long been associated with chemical pollution</a>, as people flush medicines, cosmetics, and hygiene products down the toilet or throw them in the trash. The waste ends up in water treatment plants and landfills and then makes its way into water supplies such as the Ganges.</p><p>"Aquaculture, agricultural farms, and pharma industries can be other important sources," Balakrishna added.</p><p>In 2020, Balakrishna's team <a href="https://link.springer.com/article/10.1007/s10661-020-08480-2" target="_blank" rel="noopener noreferrer">reported</a> the presence of PPCPs in two tropical rivers in southwestern India, the Swarna and Netravati, which empty into the Arabian Sea.</p><p>A 2017 <a href="https://www.sciencedirect.com/science/article/abs/pii/S0147651316304675?via%3Dihub" target="_blank" rel="noopener noreferrer">review</a> by a team of scientists including Balakrishna in <em>Ecotoxicology and Environmental Safety</em> found higher levels of pharmaceuticals in Indian water treatment plants compared with developed countries. The review also pointed out the paucity of studies in India on the fate of pharmaceutical products in water bodies and their impact on human health, "despite India being one of the world leaders in pharmaceutical production and consumption."</p><p>The 2017 review reported that studies from other countries indicated that PPCPs in rivers could accumulate in aquatic organisms and enter the food web. Antibiotic resistance among microbes is the main threat to human and ecological health, Balakrishna said. "Low doses of antibiotics in a river can be consumed by pathogens in the river, [which then] become superbugs, and multiply."</p><p>Suthar, too, cautions about both toxicity in the food web and the emergence of antibiotic resistance in pathogens contaminating river waters. "If we add up all the individual contaminant levels for 1 liter of water, the collective dose will be very toxic, especially if they bioaccumulate in organisms, including some rare species in the Ganges such as the <a href="https://www.worldwildlife.org/species/ganges-river-dolphin" target="_blank">Ganges dolphins</a>," he said. "And microbes in the waters will become resistant to the drugs."</p><p>A 2019 <a href="https://pubs.acs.org/doi/10.1021/acs.chemrev.8b00299" target="_blank" rel="noopener noreferrer">global review</a> of PPCPs in rivers reported that "no global legal maximum environmental concentrations exist for pharmaceutically active compounds," despite poor understanding of the combined acute and chronic effects of PPCPs on flora, fauna, and human health.</p><p>The global review went on to say that primary and secondary wastewater treatment plants "generally are unable to remove these pollutants, leading to their migration into drinking water supplies," and recommended advanced tertiary water treatment processes, such as oxidation and adsorption. It also suggested advanced methods for accurate and continuous monitoring of pharmaceuticals in the environment and strict regulations for effluent release.</p><p>In India, most antipollution efforts are directed at surface water treatment and focus on parameters such as chemical oxygen demand, biological oxygen demand, nitrates, and bacteria, said Suthar. "We need a policy that looks at PPCPs too."</p>
Chemical Footprints<p>The source of the Ganges is the Gangotri Glacier, high in the Himalayas less than 200 kilometers from Haridwar. The recent findings on PPCPs in the Ganges add to research documenting chemical and microplastic pollution throughout the mountain range, including the world's highest peak, <a href="https://www.theguardian.com/environment/2020/nov/20/microplastic-pollution-found-near-summit-of-mount-everest" target="_blank">Mount Everest</a>, said <a href="https://science.jpl.nasa.gov/people/Miner/" target="_blank">Kimberley Miner</a>, a scientist at NASA's Jet Propulsion Laboratory in California and a research assistant professor at the Climate Change Institute, University of Maine. "Our team found PFAS [polyfluoroalkyl substances], DDT [dichlorodiphenyltrichloroethane], and toxic metals on the mountain, suggesting that the chemical footprint left by trekkers may be as large as the visible trash and pollution footprint."</p><p>The new Ganges research also echoes recent studies tracing PPCPs on <a href="https://eos.org/articles/fragrances-in-an-ice-core-tell-a-story-of-human-activity" target="_blank">European glaciers</a>, where researchers traced chemical pollutants to the use of perfumes in personal care products like soap. Perfumed soaps and ointments are also associated with PPCPs in Haridwar and Rishikesh, where mass bathing events are part of tourism and pilgrimage activities.</p><p><em>This story originally appeared in <a href="https://eos.org/articles/pharmaceuticals-pollute-the-ganges" target="_blank">Eos</a></em> <em>and is republished here as part of Covering Climate Now, a global journalism collaboration strengthening coverage of the climate story.</em></p>
Residential solar energy companies are helping more and more homeowners upgrade their properties to clean energy sources. Solar energy companies can equip you with the technology you need to harness the amazing power of the sun and reduce your need for fossil fuels. In this article, we'll review some of the most trustworthy providers and installers of solar power.
Our picks for the best solar companies
The first step in the process is researching some of the top companies in the solar industry. Here are the ones that stood out in our research.
Each product featured here has been independently selected by the writer. If you make a purchase using the links included, we may earn commission.
How we chose the best solar energy companies
How did we determine which solar power companies to recommend?
To begin with, we took a deep dive into each company's offerings, assessing them for the following criteria:
- Range of services offered
- Pricing/affordability and financing options
- Extent of service area
- Solar panel efficiency
- Temperature coefficient (e.g., how much high temperatures affect efficiency)
Additionally, we weighed membership and certification by professional associations like the Solar Energy Industries Association (SEIA). Affiliation with these groups is a good indicator that a solar energy company is reputable, and that their work is up to the highest standards within the industry.
The best solar energy companies
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With these criteria in mind, consider our picks for the best solar panel providers and installers in the industry.
If you're looking for a company that can walk you through the process of upgrading to solar power for an easy and convenient experience, look no further than to SunPower. The company offers:
- A "design studio" app, allowing you to safely and seamlessly design your own solar power system so that you can see a visual of what the finished product will look like once installed.
- Online calculators that make it easy for you to determine about how much electricity you will save once you upgrade to solar panels.
- Virtual consultations, allowing you to chat one-on-one with a solar power expert and to ask any questions you might have.
SunPower offers leading solar panels and energy storage technology to homeowners across dozens of states. And, they are also the preferred solar partner of many major businesses, including Walmart, FedEx, and Lowes.
Why buy: SunPower is a reliable solar energy company with an impressive tech portfolio and an extremely easy, intuitive process.
Upgrading to solar power can seem a little intimidating, but SunRun is out to bring simplicity. Their approach makes it extremely straightforward to select a custom solar energy plan for your household. Here's what to know about SunRun:
- They offer virtual consultations with solar energy experts, making it simple to explore your options and determine which solar set-up is right for your home energy needs.
- Each system they design is completely customized to address the customer's needs. SunRun doesn't do "one size fits all" solar equipment options.
- Their guarantee, the best in the industry, offers extraordinary peace of mind that your solar system will prove durable and reliable.
- SunRun also leads in terms of flexible financing options, making solar power accessible and affordable.
Why buy: With SunRun, the name of the game is customization. This is one of the best solar installation companies to turn to for solar power solutions that are truly made with you in mind.
You probably associate Tesla with their electric vehicles, but did you know that the company also produces high-efficiency solar panels? Depending on your needs and your budget, Tesla can hook you up with an array of solar panels or even a solar roof, making it easy to cut electricity costs and power your home via the sun's vital energy.
Some fast facts about choosing solar power from Tesla:
- They offer a price match guarantee and affordable financing options.
- Their advanced solar panel technology offers a low profile, a sleek style, and long-term durability.
- Home battery backups allow you to save solar power and then access it on demand, whenever you need it.
Why buy: Tesla offers sophisticated solar products for what the company claims is the lowest price of any national provider, which they back with a price-match guarantee. Plus, all of their solar panels come with a solid 25-year performance guarantee.
LG is another well-known tech company that is also a leader in solar energy. Some of their solar panels use a bifacial solar module that captures energy from two directions to increase their efficiency. While they are a solar panel manufacturer, they can also help you with the installation process by finding an LG Pro installer in your area.
- They offer an online "solar concierge" service that allows you to evaluate your home energy needs and to compare different options for going solar.
- LG offers a 25-year warranty, not only on their technology but also on the work their of their solar installers.
- They offer a range of solar panels and supporting products, and they supply you with plenty of information to make a fully informed choice.
Why buy: LG is a company that knows technological innovation. Their award-winning solar energy products are reliably efficient, well-priced, and designed for maximum efficiency.
Panasonic has one of the most impressive tech portfolios in the solar energy industry. Their products boast some of the highest conversion efficiency rates, along with the lowest degradation rates. And they back everything with a generous warranty.
Some additional reasons to choose Panasonic:
- They offer a range of solar panels to choose from. With Panasonic, you'll find that you have plenty of options.
- They also provide a lot of great online support and consumer education, ensuring you'll get the most out of your solar technology.
Why buy: Panasonic is a solar panel company with products that are tough to beat. Both their pricing and warranties are very appealing, and their HIT high-performance solar panels offer some of the best power conversion rates of any product.
Vivint is a company that offers a full spectrum of services, including solar power consultation, design, and installation. A few reasons why homeowners trust their solar power needs to the Vivint team:
- Everything Vivint does is customized. They tailor everything to fit your roof and to help you achieve your home energy goals.
- They make the entire process simple, handling all of the little details for you. This includes securing permits, filing the right paperwork, etc.
- They emphasize safety, using only the highest caliber of solar panels and backing everything with a world-class warranty.
Why buy: Vivint is noteworthy for their focus on customization, their commitment to safety, and their one-stop-shop solar power solutions. In addition to solar panel installation, they also offer other specialized technology, including solar-powered electric vehicle chargers.
Enphase is another company that stands out, both for their robust technology as well as for their commitment to customization. Their microinverter technology makes their solar system safer by reducing the likelihood of arc fault fires.
- They design their solar technology with safety in mind, including fire safeguards that other companies can't match.
- Their solar panels are built for durability and can hold up even through the most extreme kinds of weather.
- Enphase uses smart technology to update itself; all you need to do is connect it to your home Internet.
- They also have one of the best apps in the solar industry, making it simple to monitor your home energy use.
Why buy: Enphase is a company of innovators, and their solar portfolio has a lot to offer. Their system is also modular, meaning you can easily add more panels to your system as you need them.
This solar power provider has won recognition not just for their excellent technology, but also for their sincere commitment to sustainability and to ecological stewardship. And don't let the name throw you off: Though Canadian Solar is based in Canada, they provide solar power solutions in the U.S. and other countries.
Some additional facts about Canadian Solar:
- They offer a wide range of products, from energy converters to storage solutions.
- Their solar panels boast exceedingly high energy efficiency rates.
- Canadian Solar has won a number of awards for its first-class innovations, and one of their products even set a world record for conversion efficiency in 2020.
Why buy: This company has a proven track record of technological excellence, plus a real commitment to ecological stewardship. They also closely monitor their supply chain to ensure that no goods or materials used in their products come from prohibited forms of labor.
First Solar boasts an impressive track record of advocacy for solar power and for renewable energy sources. And, thankfully, they back their advocacy with some excellent solar technologies.
A few reasons to choose First Solar solar panels:
- Their technology offers an outstanding temperature coefficient, meaning they won't lose performance during high temperatures.
- Their solar cells are among the most reliable and most efficient in the clean energy sector.
- First Solar also offers a lot of post-purchase, post-installation help, as needed.
Why buy: First Solar is a great option for anyone who's serious about renewable energy, and who wants the best performance from their solar panels.
The biggest drawback to Go Solar is that, right now, their work is limited to just a few states. But if you happen to live in that part of the country, you're in luck. Go Solar's panels are uniquely calibrated to take advantage of the western region's abundant sunlight. Some additional reasons to pick Go Solar include:
- They offer free home solar assessments.
- They custom-design solar systems to meet the needs of your home.
- They have some of the most trusted installers in the solar power industry.
Why buy: For solar solutions that are tailored to the climate of the American West, definitely consider Go Solar. Plus, with their Give Solar International partnership, they give an equivalent solar panel system to a family in Uganda for each system sold.
How does a solar energy system work?
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As you explore the different options for embracing solar power, it may be helpful to have a baseline understanding of how solar energy systems actually function.
Generally speaking, solar energy systems involve solar panels installed on your roof. These panels absorb the sun's energy, storing it in what are known as photovoltaic cells. These cells convert the solar energy into direct current (DC) energy, then use an inverter to convert that DC energy into alternate current (AC) electricity. AC electricity is what you need to power all your home appliances.
It's important to note that, before you purchase solar panels, it's worthwhile to meet with a solar energy consultant who can tell you more about how many panels your home will require, and also to let you know how those panels should be ideally positioned on the roof.
One more note: If you're concerned about the affordability of solar power, it's important to remember that most solar energy companies provide a host of options, including flexible financing and solar lease options for a system rather than purchase it outright. As you talk with different solar energy companies, don't hesitate to inquire about these leasing and financing options.
Benefits of solar energy
Installing solar panels on your home can yield a number of benefits. Here are just a few examples.
One of the main reasons why homeowners choose to install solar cells is that it allows them to truly embrace clean energy sources. Rather than depend on fossil fuels and power plants, you can power your home with renewable energy that comes straight from the sun. This can be a highly effective way to minimize your environmental footprint.
Solar tax credits and rebates
There are a number of ways in which choosing renewable energy can save you money, starting with the fact that there are so many rebates and tax credits available. Essentially, both the federal government and many state governments want to encourage people to "go green" as much as possible, and they will make it worth your while by allowing you to claim these important tax incentives. Some utility companies also offer rebates that can help pay for the upfront costs of solar projects.
Lower electricity bills
Of course, embracing solar power will also help you save money by slashing your electricity bills. Most solar energy companies offer online calculators that allow you to see for yourself how much money you'll save over time, simply by changing to a renewable energy source. There is also an option called a power purchase agreement (PPA) that can allow you to host a solar or renewable energy system from a utility provider in exchange for lowered energy rates. If your solar panel system generates excess energy, the utility will then purchase that energy from you in the form of a net metering credit on your bill.
Make a smart choice about solar power
There are obviously a lot of perks to choosing solar energy for your home. And yet, it can also be a rather daunting process, simply because there are so many solar energy companies to choose from.
Using our guidelines and rankings, start doing your due diligence, seeking the solar power company that's right for you. Remember to look for a company that's well-regarded within the industry and get a consultation before you buy. Always be sure to ask some direct questions about the financing options that are available to you.
Josh Hurst is a journalist, critic, and essayist. He lives in Knoxville, TN, with his wife and three sons. His writing on natural health, nutrition, and supplements has appeared in Health, Shape, and Remedy Review.
By Katherine Kornei
Clear-cutting a forest is relatively easy—just pick a tree and start chopping. But there are benefits to more sophisticated forest management. One technique—which involves repeatedly harvesting smaller trees every 30 or so years but leaving an upper story of larger trees for longer periods (60, 90, or 120 years)—ensures a steady supply of both firewood and construction timber.
A Pattern in the Rings<p>The <a href="https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/coppice-standards-0" target="_blank">coppice-with-standards</a> management practice produces a two-story forest, said <a href="https://www.researchgate.net/profile/Bernhard_Muigg" target="_blank">Bernhard Muigg</a>, a dendrochronologist at the University of Freiburg in Germany. "You have an upper story of single trees that are allowed to grow for several understory generations."</p><p>That arrangement imprints a characteristic tree ring pattern in a forest's upper story trees (the "standards"): thick rings indicative of heavy growth, which show up at regular intervals as the surrounding smaller trees are cut down. "The trees are growing faster," said Muigg. "You can really see it with your naked eye."</p><p>Muigg and his collaborators characterized that <a href="https://ltrr.arizona.edu/about/treerings" target="_blank">dendrochronological pattern</a> in 161 oak trees growing in central Germany, one of the few remaining sites in Europe with actively managed coppice-with-standards forests. They found up to nine cycles of heavy growth in the trees, the oldest of which was planted in 1761. The researchers then turned to a historical data set — more than 2,000 oak <a href="https://eos.org/articles/podcast-discovering-europes-history-through-its-timbers" target="_blank" rel="noopener noreferrer">timbers from buildings and archaeological sites</a> in Germany and France dating from between 300 and 2015 — to look for a similar pattern.</p>
A Gap of 500 Years<p>The team found wood with the characteristic coppice-with-standards tree ring pattern dating to as early as the 6th century. That was a surprise, Muigg and his colleagues concluded, because the first mention of this forest management practice in historical documents occurred only roughly 500 years later, in the 13th century.</p><p>It's probable that forest management practices were not well documented prior to the High Middle Ages (1000–1250), the researchers suggested. "Forests are mainly mentioned in the context of royal hunting interests or donations," said Muigg. Dendrochronological studies are particularly important because they can reveal information not captured by a sparse historical record, he added.</p><p>These results were <a href="https://www.nature.com/articles/s41598-020-78933-8" target="_blank">published in December in <em>Scientific Reports</em></a>.</p><p>"It's nice to see the longevity and the history of coppice-with-standards," said <a href="https://www.teagasc.ie/contact/staff-directory/s/ian-short/" target="_blank">Ian Short</a>, a forestry researcher at Teagasc, the Agriculture and Food Development Authority in Ireland, not involved in the research. This technique is valuable because it promotes conservation and habitat biodiversity, Short said. "In the next 10 or 20 years, I think we'll see more coppice-with-standards coming back into production."</p><p>In the future, Muigg and his collaborators hope to analyze a larger sample of historic timbers to trace how the coppice-with-standards practice spread throughout Europe. It will be interesting to understand where this technique originated and how it propagated, said Muigg, and there are plenty of old pieces of wood waiting to be analyzed. "There [are] tons of dendrochronological data."</p><p><em><a href="mailto:[email protected]" target="_blank" rel="noopener noreferrer">Katherine Kornei</a> is a freelance science journalist covering Earth and space science. Her bylines frequently appear in Eos, Science, and The New York Times. Katherine holds a Ph.D. in astronomy from the University of California, Los Angeles.</em></p><p><em>This story originally appeared in <a href="https://eos.org/articles/tree-rings-reveal-how-ancient-forests-were-managed" target="_blank">Eos</a></em> <em>and is republished here as part of Covering Climate Now, a global journalism collaboration strengthening coverage of the climate story.</em></p>
By Alison Gold
Wildfire activity has increasingly threatened life in the western United States over the past several decades. Many of this year's record-setting wildfires raged over hundreds of thousands of acres. However, one of their most dangerous and understudied effects is too small to perceive with the naked eye: the tiny particles that can be inhaled deeply into the lungs.
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