We’re Just Starting to Learn How Fracking Harms Wildlife
By Tara Lohan
In January 2015 North Dakota experienced one of the worst environmental disasters in its history: A pipeline burst, spilling nearly 3 million gallons of briny, saltwater waste from nearby oil-drilling operations into two creek beds. The wastewater, which flowed all the way to the Missouri River, contained chloride concentrations high enough to kill any wildlife that encountered it.
It wasn't the first such disaster in the state. In 2006 a spill of close to 1 million gallons of fracking wastewater into the Yellowstone River resulted in a mass die-off of fish and plants. Cleanup of that spill was still ongoing at the time of the 2015 spill, nearly a decade later.
Spills like these highlight the dangers that come with unconventional fossil-fuel extraction techniques that go after hard-to-reach pockets of oil and gas using practices like horizontal drilling and high-volume hydraulic fracturing (otherwise known as fracking).
But events like these massive spills are just the tip of the iceberg. Other risks to wildlife can be more contained, subtle or hidden.
And while many of the after-effects of fracking have grabbed headlines for years — such as contaminated drinking water, earthquakes and even flammable faucets — the consequences for wildlife have so far been left out of the national conversation.
But those consequences are very real for a vast suite of animals including mussels, birds, fish, caribou and even fleas, and they're as varied as the species themselves. In some places wildlife pays the price when habitat is destroyed. Elsewhere the damage occurs when water is sucked away or polluted. Still other species can't take the traffic, noise and dust that accompany extraction operations.
All this damage makes sense when you think about fracking's outsized footprint.
It starts with the land cleared for the well pad, followed by sucking large volumes of water (between 1.5 and 16 million gallons per well) out of rivers, streams or groundwater.
Fracking trucks and equipment in Doddridge Co, West Virginia.
Then there's the sand that's mined for use during the fracturing of underground rock to release natural gas or oil. There are also new pipelines, compressor stations and other related infrastructure that need to be constructed. And there's the truck traffic that surges during operations, or the disposal of fracking wastewater, either in streams or underground.
The cumulative footprint of a single new well can be as large as 30 acres. In places where hundreds or thousands of wells spring up across a landscape, it's easy to imagine the toll on wildlife — and even cases with ecosystem-wide implications.
"Studies show that there are multiple pathways to wildlife being harmed," said ecologist Sandra Steingraber, a distinguished scholar in residence at Ithaca College who has worked for a decade compiling research on the health effects of fracking. "Biodiversity is a determinant of public health — without these wild animals doing ecosystem services for us, we can't survive."
The most obvious threats fracking poses to wildlife comes in the form of habitat loss.
As rural areas become industrialized with each new well pad and its associated infrastructure, vital habitat for wildlife is altered or destroyed.
Habitat fragmentation in North Dakota's Bakken shale.
And it's not just the area containing the well. The land or water just outside of the operation, known as "edge habitat," also degrades with an increase in the spread of invasive plant species, among other concerns.
And large-scale development, such as miles-long pipelines, can change the way species move and hunt, often resulting in an increase in predation. The oil and gas development in Alberta, Canada, for example, created "wolf highways" that gave the predators easy access to an endangered herd of woodland caribou.
Roads, another kind of fragmentation, can be particularly dangerous for wildlife. A single fracked well can be responsible for 3,300 one-way truck trips during its operational lifespan, and each journey can injure or kill wildlife large and small. After all, it's hard to get out of the way of a tanker truck carrying 80,000 pounds of sand.
And then there's the big picture. Drilling within large, "core" forest areas previously located far from human development can be permanently detrimental for species such as migratory songbirds.
In one study, published in Biological Conservation in 2016, researchers examined the effects of unconventional gas drilling on forest habits and populations of birds in an area of West Virginia overlaying the Marcellus and Utica shales. The area has been at the center of the shale gas boom, with the number of unconventional wells in central Appalachia jumping from 111 in 2005 to 14,022 by the end of 2015. The study found that shale-gas development there during that period resulted in a 12.4 percent loss of core forest and increased edge habitat by more than 50 percent — and that, in turn, changed the communities of birds found in the forest.
The areas near well pads experienced an overall decline in "forest specialists" — birds that prefer interior forest habitat, among them the hooded warbler and Kentucky warbler, which are of high conservation priority, as well as cerulean warblers. These sky-blue endangered migratory songbirds have been dropping in numbers for decades, but researchers noted that the decline was 15 percent higher in their study area than in the greater Appalachian Mountains region during the same period.
Kentucky warblers prefer large core forest habitat and researchers have found they decline in numbers around shale gas development.
Andrew Weitzel / CC BY-SA 2.0
"For migratory songbirds, large blocks of forest are very important," explains Margaret C. Brittingham, a professor of wildlife resources at Penn State University who has studied the effects of fracking on wildlife. The birds do best in interior forest habitat with mature trees. They also serve as an important part of the forest ecosystem, helping to prevent or suppress insect outbreaks that can damage trees. "They're co-evolved with the forest, feeding on insects and keeping those forests healthy," she said.
Not all species declined in numbers from fracking development. The study found an increase in the kinds of birds that do well among humans and in developed areas — "habitat generalists" such as the American robin, blue jay and brown-headed cowbird, the latter of which are notorious brood parasites that leave their eggs in nests of other birds.
"I think the most alarming thing about all of this is what bird declines may indicate about the declining health of overall ecosystems," said Laura Farwell, a postdoctoral research associate in the department of Forest and Wildlife Ecology at the University of Wisconsin-Madison and lead author of the Biological Conservation study. "I know it's a cliché, but forest interior birds truly are 'canaries in the coal mine' for Appalachian forests experiencing rapid loss and fragmentation."
Farwell adds that many other kinds of development contribute to habitat loss that result in biodiversity declines. Fracking is one more added pressure, but the consequences are quite significant.
"It just happens to be disproportionately affecting some of the largest remaining areas of undisturbed, mature forest left in the eastern U.S., and these forests are incredibly valuable for biodiversity," she said.
Out West the industry is carving up a different kind of habitat, and that has other species on the ropes. Greater sage grouse, for example, depend on large home ranges composed of intact areas of sagebrush. Cattle ranching and development of all kinds have pushed the grouse near extinction, and continued unbridled oil and gas extraction in its remaining habitat could tip it over the edge.
A 2014 study co-authored by Brittingham found that oil and gas infrastructure and related disturbances to sage grouse can cause the birds' populations to decline — or even disappear in areas with particularly high levels of oil and gas development.
Sage grouse have also been shown to exhibit high levels of stress from noise.
Noise poses additional risks for birds that depend on their hearing. A study published in Biological Conservation in 2016 found that noise from compressor stations, which run 24 hours a day, reduced the ability of northern saw-whet owls to catch prey. The researchers found that for owls and other "acoustically specialized predators," noise can cause significant negative impacts on behavior, like a decreased ability to hunt, and that can ripple through the ecosystem.
Lights on a drilling site in West Virginia can affect nocturnal wildlife.
Light, too, can be a problem. Oil and gas operations in some places have turned once-dark rural areas into blazing mini-cities in quick time. A 2012 photo revealed that gas burned off from wells in North Dakota's Bakken Shale was so bright it was visible from space — something not seen just six years before. Light pollution like this can be deadly for migratory birds and disrupt other nocturnal animals.
It’s in the Water
The fracking process uses a lot of water and much of that contaminated H2O returns to the surface, bringing with it heavy metals, radioactivity, toxic chemicals (many of which are industry trade secrets) and high levels of salinity. Disposing of all that wastewater has created headaches for the industry and in some cases it's now proving to endanger wildlife.
Spills or intentional dumping of wastewater or fracking fluid released 180 million gallons into the environment between 2009 and 2014, according to an investigation by the Associated Press. Unsafe levels of some contaminants have been found to persist for years, as was the case in North Dakota.
Not all spills and intentional releases of wastewater in streams create noticeable impacts like fish going belly up — some are more subtle and harder to see — but they may still take a real toll on aquatic life.
A 2019 study in Ecotoxicology and Environmental Safety looked at what happens when insects called water fleas encounter a fracking-fluid spill. Researchers found that even when the fluids were diluted in a stream, their high salinity could decrease insect mobility and survival. The Canadian province of Alberta, the researchers noted, has recorded 100 such large-volume spills.
Lowly water fleas — in this case a species called Daphnia magna — may not seem like animals we should worry about, but like so many small creatures, they occupy an important niche.
"They are the basis of the freshwater ecosystem," Steingraber explained. "When the water fleas are gone, the guys that feed on them are gone — frogs and fish die, and those that feed on them die and suddenly you have a biodiversity problem because you've knocked out a species at the bottom of the aquatic food chain."
Some of this may already be playing out in other locations. A 2016 study published in Ecotoxicology that found a decrease in biodiversity of macroinvertebrates in Pennsylvania streams where fracking was occurring in the watershed — and, even worse, "no fish or no fish diversity at streams with documented frackwater fluid spills." In some cases streams that once contained large numbers of brook trout had none left. The researchers concluded that "fracking has the potential to alter aquatic biodiversity…at the base of food webs."
Brook trout have disappeared from some streams in central Appalachia following fracking spills.
Elsewhere, it's possible that contamination of surface waters has already taken a toll on the Louisiana waterthrush (Parkesia motacilla), a bird that breeds along forest headwater streams and feeds on macroinvertebrates. A 2015 study published in Ecosphere found that shale gas development had negative effects on the nest survival and productivity of waterthrushes and the researchers posited that "indirect effects on stream and terrestrial food webs from possible contamination" by the oil and gas industry could be to blame.
The research, which looked at sites in both the Marcellus and Fayetteville shale regions, showed that the birds' feathers contained elevated levels of barium and strontium — two heavy metals associated with the drilling process — in areas where fracking had taken place. Much like when lead shows up in a human's hair, the presence of these metals in the birds' feathers is a sign that contaminants in the environment are making their way into animals' bodies.
And that raises even bigger concerns.
As the researchers concluded in their paper: "Our finding of significantly higher levels of barium and strontium also suggests the possibility of surface water contamination by any of the hundreds of chemicals that may be used in hydraulic fracturing, including friction reducers, acids, biocides, corrosion and scale inhibitors, pH adjusting agents and surfactants."
A similar line of inquiry is being pursued by other researchers. Nathaniel Warner, a professor of civil and environmental engineering at Penn State University, has been using the shells of freshwater mussels to read the changes in water chemistry in Pennsylvania's Allegheny River. Mussels record environmental conditions in their shells each year — much like tree rings.
Warner and his colleagues have also found elevated levels of strontium in the shells of mussels living downstream from a site where treated fracking wastewater was discharged. Strontium, which is found in high concentrations in oil and gas wastewaters, is a naturally occurring metal with some medical benefits but which in large exposures can cause bone loss and other side effects.
But Warner says they are still trying to determine what the impacts are for mussels and aquatic ecosystems — not to mention the people who get their dinner from the river.
"We haven't really gotten to the point where we can say this is harmful or not," he said. "We really focused on the hard shell itself. But now we're looking more at what happens in that soft tissue because muskrats and fish don't really eat the shell that much, but they eat the soft tissue. And so what levels of contaminants or pollution ended up in that soft tissue compared to the shell?" He said that's probably more important for determining what this really means for wildlife or even human health.
University of Wisconsin's Farwell says that she'd also like to see more research on what the accumulation of contaminants in the bodies of waterthrushes means for other wildlife and for humans. "Air pollution is another important issue to consider," she added. "I'm not aware of any current studies that have looked directly at impacts of fracking air pollution on wildlife."
You can add these topics to the long list researchers are hoping to explore, but there will still be a lot about how fracking and other extraction technologies are affecting wildlife that we don't know. And with natural gas still projected to be one of the fastest growing energy sources in the United States, the time to understand its impacts on wildlife grows short.
"The industry boomed at such a rapid pace, researchers and policymakers could barely keep up," she said. "And in most cases, we don't have baseline data at impacted sites to compare with current numbers. Unfortunately, most of us studying fracking impacts have been playing a game of catch-up since the beginning."
Reposted with permission from our media associate The Revelator.
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By Sara Lindberg
Whether you've hit a workout plateau or you're just ready to turn things up a notch, adding more strenuous exercise — also known as high-intensity exercise — to your overall fitness routine is one way to increase your calorie burn, improve your heart health, and boost your metabolism.
However, to do it safely and effectively, there are some guidelines you should follow. Keep reading to learn more about the benefits of vigorous exercise and how to safely dial up the intensity of your workouts.
What Is Considered Strenuous Exercise?<p>When it comes to exercise, the intensity of how hard you work out is just as important as the duration of your exercise session. In general, exercise intensity is divided into three categories:</p><ul><li>low</li><li>moderate</li><li>vigorous or strenuous</li></ul><p>For an activity to be vigorous, you need to work at 70 to 85 percent of your maximum heart rate, according to the<a href="https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates" target="_blank"> American Heart Association</a>. Examples of vigorous exercise include:</p><ul><li>running</li><li>cycling at 10 mph or faster</li><li>walking briskly uphill with a heavy backpack</li><li>jumping rope</li></ul><p>Low to moderate exercise is easier to sustain for longer periods since you work below 70 percent of your maximum heart rate and, sometimes, well below that level.</p><p>To reap health benefits, the <a href="https://www.hhs.gov/fitness/be-active/physical-activity-guidelines-for-americans/index.html" target="_blank">Physical Activity Guidelines for Americans</a> recommends that people age 18 and older get one of the following:</p><ul><li><strong>150 minutes</strong> of moderate-intensity aerobic activity per week</li><li><strong>75 minutes</strong> of vigorous aerobic activity per week</li><li><strong>combination of both types</strong> of activity spread throughout the week</li></ul>
Strenuous Exercise Vs. Moderate Exercise<p>Increasing your exercise intensity is fairly simple to do. You can still participate in your favorite activities — just at a more vigorous pace.</p><p>One of the benefits of more strenuous exercise is that you can reap the same rewards as moderate-intensity exercise but in less time. So, if time is of the essence, doing a more strenuous 20-minute workout can be just as beneficial as doing a slower 40-minute workout session.</p><p>Here are some examples of <a href="https://www.cdc.gov/nccdphp/dnpa/physical/pdf/pa_intensity_table_2_1.pdf" target="_blank">strenuous vs. moderate exercise<span></span></a>.</p><table><tbody><tr><th>Moderate intensity</th><th>Strenuous intensity</th></tr><tr><td>bicycling at less than 10 mph</td><td>bicycling at more than 10 mph</td></tr><tr><td>walking briskly</td><td>running, or hiking uphill at a steady pace</td></tr><tr><td>jog-walk intervals</td><td>water jogging/running</td></tr><tr><td>shooting baskets in basketball</td><td>playing a basketball game</td></tr><tr><td>playing doubles tennis</td><td>playing singles tennis</td></tr><tr><td>raking leaves or mowing the lawn</td><td>shoveling more than 10 lbs. per minute, digging ditches</td></tr><tr><td>walking stairs</td><td>running stairs</td></tr></tbody></table>
Benefits of Vigorous Exercise<p>Besides being more efficient, turning up the heat on your fitness sessions can benefit your health in a variety of ways. Let's take a closer look at some of the evidence-based benefits of a higher intensity workout.</p><ul><li><strong>Higher calorie burn.</strong> According to the <a href="https://www.acefitness.org/education-and-resources/professional/expert-articles/5008/7-things-to-know-about-excess-post-exercise-oxygen-consumption-epoc/?utm_source=Rakuten&utm_medium=10&ranMID=42334&ranEAID=TnL5HPStwNw&ranSiteID=TnL5HPStwNw-hYlKnAcfzfixAUsvnO6Ubw" target="_blank">American Council on Exercise</a>, working out at a higher intensity requires more oxygen, which burns more calories. It also contributes to excess post-exercise oxygen consumption (EPOC) or the "afterburn effect" that allows you to continue burning calories even after you finish working out. This means your metabolism will stay elevated for longer after a vigorous exercise session.</li><li><strong>More weight loss.</strong> A <a href="https://www.healthline.com/health-news/interval-workouts-will-help-you-lose-weight-more-quickly" target="_blank">higher calorie burn</a> and an elevated metabolism will help you lose weight more quickly than doing low- or moderate-intensity exercise.</li><li><strong>Improved heart health.</strong> According to a <a href="https://www.ncbi.nlm.nih.gov/pubmed/16377300" target="_blank">2012 study</a>, high- and moderate-intensity exercise appears to offer low chance of cardiovascular events, even in those with heart disease. Cardiovascular benefits may include improvements in:<ul><li><a href="https://www.healthline.com/health/diastole-vs-systole" target="_blank">diastolic blood pressure</a></li><li><a href="https://www.healthline.com/nutrition/15-ways-to-lower-blood-sugar#TOC_TITLE_HDR_1" target="_blank">blood sugar control</a></li><li>aerobic capacity</li></ul></li><li><strong>Improved mood.</strong> High-intensity exercise may also boost your mood. According to a large <a href="https://www.jstage.jst.go.jp/article/jpts/27/4/27_jpts-2014-736/_article" target="_blank">2015 study</a> that analyzed the data of more than 12,000 participants, researchers found a significant link between strenuous exercise and fewer depressive symptoms.</li><li><strong>Lower risk of mortality.</strong> According to a 2015 <a href="https://www.ncbi.nlm.nih.gov/pubmed/25844882" target="_blank">study</a>, researchers found that vigorous activity may be key to avoiding an early death. The study, which followed 204,542 people for more than 6 years, reported a 9 to 13 percent decrease in mortality for those who increased the intensity of their exercise sessions.</li></ul>
How to Measure Exercise Intensity<p>So, how do you know for sure that you're exercising at a strenuous level? Let's look at three ways to measure the intensity of your physical activity.</p><h3>1. Your heart rate</h3><p>Monitoring your heart rate is one of the most reliable methods for measuring exercise intensity. Exercising at 70 to 85 percent of your maximum heart rate qualifies as vigorous exercise intensity.</p><blockquote><strong><strong>WHAT IS YOUR MAXIMUM HEART RATE?</strong></strong>Your maximum heart rate is the fastest your heart can safely beat. To find out what your maximum heart rate is you need to subtract your age from 220. For example, for a 40-year-old person: <ul><li>220 bpm (beats per minute) minus age</li><li>220 – 40 = 180 bpm</li></ul>To work out at a vigorous pace, you'll want to exercise within 70 to 85 percent of your maximum heart rate. For example: <ul><li>180 x 0.70 (70 percent) = 126</li><li>180 x 0.85 (85 percent) = 153</li></ul>For a 40-year-old person, a vigorous training range is 126 to 153 bpm.<br></blockquote><p>You can check your heart rate while you're working out by wearing a heart rate monitor or <a href="https://www.healthline.com/health/how-to-check-heart-rate" target="_blank">taking your pulse</a>.</p>
How to Add Vigorous Activity to Your Workout<p>Adding strenuous activity to your weekly workout routine requires some careful planning. Fortunately, many of the activities that you do at a moderate level can easily be performed at a higher intensity.</p><p>One way of incorporating vigorous aerobic activity into your routine is to do a <a href="https://www.healthline.com/nutrition/benefits-of-hiit" target="_blank">high-intensity interval training (HIIT)</a> workout. This type of workout combines short bursts of intense activity — typically performed at 80 to 95 percent of your maximum heart rate — with recovery periods at 40 to 50 percent maximum heart rate.</p><p>To sustain this level of training, consider following a 2:1 work to rest ratio. For example, a <a href="https://www.healthline.com/health/treadmill-weight-loss#hiit" target="_blank">treadmill workout </a>or outdoor running session could include:</p><ul><li>running at 9 to 10 mph for 30 seconds</li><li>followed by walking at 3 to 4 mph for 60 seconds</li><li>alternating this work-to-rest ratio for 20 to 30 minutes</li></ul><p>Playing a fast-paced sport like soccer, basketball, or racquetball is another effective way to add strenuous activity to your fitness routine. Participating in <a href="https://www.healthline.com/health/benefits-of-a-spin-class" target="_blank">cycling classes</a> or swimming laps are other ways to build more strenuous exercise into your workouts.</p>
Safety Tips<p>Before you turn up the intensity on your workouts, it's important to keep the following safety tips in mind.</p><h3>Check with your doctor</h3><p>If you have a health condition or you haven't been active in a while, make sure you talk to your doctor before you start a high-intensity exercise routine. Your doctor can advise you on a safe level of exercise or how to become more active in the safest way possible.</p><h3>Build up the intensity slowly</h3><p>Going from low- or moderate-intensity workouts to vigorous exercise requires time and patience. While you may be ready to jump in with both feet, the safest way to add more vigorous exercise is to do it in bite-size increments. Pushing yourself too quickly can result in injuries and burnout.</p><p>For example:</p><ul><li><strong>Week 1:</strong> Swap out one moderate-paced cardio session for a HIIT workout.</li><li><strong>Week 2:</strong> Swap one moderate-paced session with a HIIT workout, and also add a circuit strength training session to your weekly routine.</li><li><strong>Week 3 and 4: </strong>Repeat weeks 1 and 2 before you start adding more high-intensity exercise to your weekly routine.</li></ul><p>It's also a good idea to space out your vigorous workouts throughout the week. Try not to do two strenuous sessions back-to-back.</p><h3>Don't forget the recovery time</h3><p>Your body requires more time to recover from a vigorous workout compared to a low- or moderate-intensity session.</p><p>To help your body recover, make sure to always include a cooldown and <a href="https://www.healthline.com/health/exercise-fitness/static-stretching" target="_blank">stretch routine</a> after strenuous physical activity.</p><h3>Stay hydrated</h3><p><a href="https://www.healthline.com/nutrition/7-health-benefits-of-water" target="_blank">Staying hydrated</a> is especially important when you're exercising hard. Not drinking enough fluids can affect the quality of your workout and make you feel tired, lethargic, or dizzy. It may even lead to <a href="https://www.healthline.com/health/dehydration-headache" target="_blank">headaches</a> and <a href="https://www.healthline.com/health/pain-relief/how-to-stop-leg-muscle-cramps" target="_blank">cramps</a>.</p>
The Bottom Line<p>Turning up the intensity of your workout sessions can be an effective way of boosting your overall health and fitness. It's also an easy way to save time when trying to fit a workout into your day.</p><p>To play it safe, always start slow and pay attention to how your body feels.</p><p>While vigorous exercise offers many health benefits, it's not appropriate for everyone. If you have a health condition or you haven't been active in a while, make sure to talk with your doctor before working out at a more strenuous level.</p>
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By Jeffrey Miller
In January 2015, food sales at restaurants overtook those at grocery stores for the first time. Most thought this marked a permanent shift in the American meal.
Solving the Age-Old Problem of Spoiled Cheese<p>People have eaten pasta and cheese together for hundreds of years. Clifford Wright, the doyen of Mediterranean food history, says <a href="http://www.cliffordawright.com/caw/food/entries/display.php/topic_id/16/id/105/" target="_blank">the first written recipe</a> for macaroni and cheese was created in the court of the king of Naples in the 13th century, while <a href="https://food52.com/blog/9916-the-history-of-macaroni-and-cheese" target="_blank">the first reference</a> in an English language cookbook likely appeared in Elizabeth Raffald's 1769 book "The Experienced English Housekeeper."</p><p><span></span>An internet search for macaroni and cheese recipes will turn up over 5 million hits, but many still prefer to get theirs in a box – the kind with pasta that comes in shapes ranging from shells to Pokemon characters, accompanied by a packet of powdered cheese sauce.</p><p>Boxed macaroni and cheese was one outcome of the quest for ways to keep cheese longer. Some cheese gets better as it ages – a well-aged cheddar is one of life's delights – but once most cheeses hit their prime, <a href="https://www.dairyfoods.com/articles/91548-how-to-maximize-cheese-shelf-life" target="_blank">they tend to quickly go bad</a>. Before household refrigeration became common, many retailers wouldn't even stock cheese in the summer because it spoiled so quickly.</p><p>Processed cheese solved this age-old problem.</p>
When Natural Was Nasty<p>Today, food that's simple, pure and natural is <a href="https://theconversation.com/how-was-french-cuisine-toppled-as-the-king-of-fine-dining-66667" target="_blank">all the craze</a>, while <a href="https://apnews.com/c06a1200807c4b82a03452d08d480692" target="_blank">disdain for processed foods</a> is practically a credo among sophisticated consumers.</p><p>But when Kraft's different forms of processed cheese came out, they found widespread acceptance despite their strange textures. The fact that it wasn't natural didn't seem to bother consumers at all. In fact, as international food historian Rachel Laudan <a href="https://online.ucpress.edu/gastronomica/article/1/1/36/93394/A-Plea-for-Culinary-Modernism-Why-We-Should-Love" target="_blank">has noted</a>, back then, "natural was something quite nasty." She describes fresh milk as warm and "unmistakably a bodily secretion." Throughout the history of cookery, most recipes aimed to transform an unappetizing raw product into something delightful and delectable.</p><p>So for most consumers, processed foods were a godsend. They kept well, tended to be easily digestible and, most importantly, they tasted good. Many of them could be easily prepared, freeing women from spending entire days cooking and giving them more time to pursue professions and avocations.</p><p>In some ways, processed foods were also healthier. They could be fortified with vitamins and minerals, and, in an era before everyone had access to mechanical refrigeration, the fact that they kept well meant consumers were less likely to contract diseases from spoiled, rotten foods. Pasteurization of dairy products virtually <a href="https://www.the-scientist.com/foundations/rethinking-raw-milk--1918-65126" target="_blank">eliminated diseases like undulant fever</a>, while foods processed and canned in large factories were less likely to harbor food-borne illnesses that could crop up due to faulty or improperly sanitized equipment used by home canners.</p>
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By Mark Kaufman
Some fires won't die.
They survive underground during the winter and then reemerge the following spring, as documented in places like Alaska. They're called "overwintering," "holdover," or "zombie" fires, and they may have now awoken in the Arctic Circle — a fast-warming region that experienced unprecedented fires in 2019. The European Union's Copernicus Atmosphere Monitoring Service is now watching these fires, via satellite.