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For decades, coal-fired power dominated the U.S. energy supply—and was a leading source of greenhouse gas emissions.
But a combination of factors including cheap natural gas, stronger pollution controls, increasing investment in renewable power and improved energy efficiency have pushed coal's share of the energy market down to 33 percent and with it the carbon-intensive fuel's share of the nation's greenhouse pollution.
Natural-gas-fired power equaled coal's 1.5 billion metric tons of carbon pollution in 2015, according to the report, while natural gas use was 81 percent higher than coal's.
As a result, this year will be the first when CO2 emissions from coal-fired power plants drop below those from natural gas, according to a new analysis from the federal Energy Information Agency (EIA).
Natural-gas-fired power equaled coal's 1.5 billion metric tons of carbon pollution in 2015, according to the report, while natural gas use was 81 percent higher than coal's. The EIA estimates that natural gas' share of energy-related CO2 will exceed that of still-declining coal by about 10 percent this year.
CO2 emissions are the leading driver of global warming and make up 81 percent of the nation's known 6.8 billion metric tons of annual greenhouse gas pollution, according to the U.S. Environmental Protection Agency (EPA). About 50 percent of those emissions come from burning fossil fuels to generate electricity and power industrial facilities.
"Coal has been declining fairly steadily since around 2007," said Doug Vine, senior energy fellow at the Center for Climate and Energy Solutions, a climate and energy think tank. "Some of the initial declines were a result of the Great Recession. But in the middle of the recession was when we began to experience the large natural gas boom."
A 2012 EPA regulation sharply reducing legal levels of mercury, arsenic and other toxic pollutants from smokestacks has also pushed utilities to invest in alternatives to coal-fired power, Vine said.
While environmentalists have long advocated an end to coal-fired power for the sake of both the climate and public health, some say that increasing reliance on natural gas is the wrong energy strategy.
"The report is a reminder that, as I say, there's good news and bad news about natural gas," said David Hawkins, the director of the climate program at the Natural Resources Defense Council (NRDC). "The good news is gas has half the carbon of coal and the bad news is gas has half the carbon of coal."
To avoid catastrophic climate change, "we have to move our society to a zero-emission economy, in a period of time that is less than the eligibility date for Social Security of kids being born today," he added. "It makes sense to keep using the existing natural gas power plants to keep backing out of coal, but we have to invest in new zero-emissions energy sources like wind, solar and efficiency" rather than continuing to spend billions of dollars on new natural gas infrastructure.
The primary ingredient of natural gas is methane, a greenhouse gas about four times more powerful at trapping heat than CO2. Methane accounts for 11 percent of known U.S. greenhouse emissions, according to the EPA. But leaks from natural gas and oil production infrastructure, leading sources of methane pollution, are not included in that figure.
Just one recent incident, the massive natural gas leak at California's Aliso Canyon storage field between October 2015 and February 2016, added the equivalent of around 4 million metric tons of carbon dioxide to the atmosphere.
A recent NASA study determined that around 250 methane leaks from natural gas and oil facilities, spread across 1,200-square-miles of the Four Corners area, where Arizona, Colorado, New Mexico and Utah meet, were the sources of a 2,500-square-mile cloud of methane hanging over the region.
"There is a lot of uncertainty about how much methane is leaking and from where. I've seen estimates from 1 to 9 percent of total production escaping," said Jeff Deyette, a senior energy analyst with the Union of Concerned Scientists. "It doesn't take much methane to leak before it becomes on par worse than coal from a total emissions standpoint. That's another risk factor of utilities continuing to switch from coal to natural gas and policy makers pushing for more use of natural gas."
Both NRDC and Union of Concerned Scientists advocate stronger regulations to control methane leaks. But "gas prices are so cheap right now, that the industry isn't investing in the technologies to capture and close up those leaks," Deyette said.
Vine agreed that given the importance of keeping global temperature increases under 3.6 degrees Fahrenheit—the goal set by the Paris climate agreement—reliance on natural gas for energy would not be a good long-term strategy for the U.S. "Natural gas can be thought of as a complementary component to wind and solar while those resources continue to expand," because "most of the natural gas electricity-generating technologies can be ramped up and down flexibly."
He also saw a role for U.S. sales of natural gas to industrializing economies seeking to lower their own greenhouse gas emissions. "It allows us to export a lower-emitting fuel to places like China and India," Vine said. "It can help some developing countries by offering them alternatives to coal, a higher-emitting fossil fuel."
"Developing countries have plenty of renewable energy potential," Deyette countered. "We're not trying to put landlines through all of Africa, right? We're using cell phone technology. In the same vein, we don't want to swap one fossil fuel out for another when we have the capacity to leapfrog to totally renewable technologies in those countries."
"We should be exporting renewable energy, grid integration and battery technologies as a country," he said. "That should be our priority."
This article was reposted with permission from our media associate TakePart.
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By Will Sarni
It is far too easy to view scarcity and poor quality of water as issues solely affecting emerging economies. While the images of women and children fetching water in Africa and a lack of access to water in India are deeply disturbing, this is not the complete picture.
The Past is No Longer a Guide to the Future
We get ever closer to "day zeros" — the point at when municipal water supplies are switched off — and tragedies such as Flint. These are not isolated stories. Instead they are becoming routine, and the public sector and civil society are scrambling to address them. We are seeing "day zeros" in South Africa, India, Australia and elsewhere, and we are now detecting lead contamination in drinking water in cities across the U.S.
"Day zero" is the result of water planning by looking in the rear-view mirror. The past is no longer a guide to the future; water demand has outstripped supplies because we are tied to business-as-usual planning practices and water prices, and this goes hand-in-hand with the inability of the public sector to factor the impacts of climate change into long-term water planning. Lead in drinking water is the result of lead pipe service lines that have not been replaced and in many cases only recently identified by utilities, governments and customers. An estimated 22 million people in the US are potentially using lead water service lines. This aging infrastructure won't repair or replace itself.
One of the most troubling aspects of the global water crisis is that those least able to afford access to water are also the ones who pay a disproportionately high percentage of their income for it. A report by WaterAid revealed that a standard water bill in developed countries is as little as 0.1 percent of the income of someone earning the minimum wage, while in a country like Madagascar a person reliant on a tanker truck for their water supply would spend as much as 45 percent of their daily income on water to get just the recommended daily minimum supply. In Mozambique, families relying on black-market vendors will spend up to 100 times as much on water as those reached by government-subsidized water supplies.
Finally, we need to understand that the discussion of a projected gap between supply and demand is misleading. There is no gap, only poor choices around allocation. The wealthy will have access to water, and the poor will pay more for water of questionable quality. From Flint residents using bottled water and paying high water utility rates, to the poor in South Africa waiting in line for their allocation of water — inequity is everywhere.
Water Inequity Requires Global Action — Now.
These troubling scenarios beg the obvious question: What to do? We do know that ongoing reports on the 'water crisis' are not going to catalyze action to address water scarcity, poor quality, access and affordability. Ensuring the human right to water feels distant at times.
We need to mobilize an ecosystem of stakeholders to be fully engaged in developing and scaling solutions. The public sector, private sector, NGOs, entrepreneurs, investors, academics and civil society must all be engaged in solving water scarcity and quality problems. Each stakeholder brings unique skills, scale and speed of impact (for example, entrepreneurs are fast but lack scale, while conversely the public sector is slow but has scale).
We also urgently need to change how we talk about water. We consistently talk about droughts happening across the globe — but what we are really dealing with is an overallocation of water due to business-as-usual practices and the impacts of climate change.
We need to democratize access to water data and actionable information. Imagine providing anyone with a smartphone the ability to know, on a real-time basis, the quality of their drinking water and actions to secure safe water. Putting this information in the hands of civil society instead or solely relying on centralized regulatory agencies and utilities will change public policies.
Will Sarni is the founder and CEO of Water Foundry.
Note: This post also appears on the World Economic Forum.
Reposted with permission from our media associate Circle of Blue.
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- Mice exposed to nicotine-containing e-cigarette vapor developed lung cancer within a year.
- More research is needed to know what this means for people who vape.
- Other research has shown that vaping can cause damage to lung tissue.
A new study found that long-term exposure to nicotine-containing e-cigarette vapor increases the risk of cancer in mice.
Six months: That's how much time Mexico now has to report on its progress to save the critically endangered vaquita porpoise (Phocoena sinus) from extinction.
It may seem innocuous to flush a Q-tip down the toilet, but those bits of plastic have been washing up on beaches and pose a threat to the birds, turtles and marine life that call those beaches home. The scourge of plastic "nurdles," as they are called, has pushed Scotland to implement a complete ban on the sale and manufacture of plastic-stemmed cotton swabs, as the BBC reported.
By Tim Radford
Scientists in the U.S. have added a new dimension to the growing hazard of extreme heat. As global average temperatures rise, so do the frequency, duration and intensity of heatwaves.
Oscar-award winning actress and long-time political activist Jane Fonda was arrested on the steps of Capitol Hill in Washington, DC on Friday for peacefully protesting the U.S. government's inaction in combating the climate crisis, according to the AP.
By Caroline Hickman
I'm up late at night worrying that my baby brothers may die from global warming and other threats to humanity – please can you put my mind at rest? – Sophie, aged 17, East Sussex, UK