Coal plants are often a source of jobs, but many are also a source to global warming.
As a result, federal regulators are considering new rules that could make coal plants more energy efficient.
A new study shows that emissions from coal plants in the United States have dropped significantly over the past decade and are now at levels that are significantly lower than in the years before the 2010 global financial crisis.
The report, published this week by the Environmental Working Group, a nonprofit group that studies climate change, is based on a review of government records.
The analysis also showed that the amount of carbon dioxide that coal plants are producing per unit of electricity has been on a downward trend since 2000.
The study used data from the U.S. Environmental Protection Agency’s Emissions Trading Scheme, which allows companies to buy credits from power plants and then sell those credits to the government to offset emissions.
The group found that in the decade since 2008, coal plants have reduced their emissions by 8.9 percent, from 17.5 tons of carbon to 14.6 tons.
The largest reductions were seen in the Midwest and West, where emissions have dropped more than a third and 38 percent, respectively.
The emissions reductions are expected to help reduce U.N. climate goals.
The E.P.G. says that the new rules will allow the federal government to buy carbon credits from coal companies to offset carbon emissions.
That means the federal Treasury will be able to buy more credits for each ton of coal produced.
But the E.U. is planning to phase out carbon credits by 2030.
Under the Clean Power Plan, the E and P countries will work together to reduce emissions.
Coal is an important source of greenhouse gas emissions because it emits so much carbon dioxide per unit energy that it has a big impact on global warming, the group found.
Coal plants account for roughly 13 percent of the electricity used in the U, and the coal sector accounts for about half of total U.T.C. emissions.
As coal plants become more energy-efficient, they will be more efficient at burning coal.
In the study, the authors found that the average efficiency of coal plants decreased by 3.4 percent between 2009 and 2014.
But they found that efficiency improvements over the course of that time period were offset by an increase in emissions from other types of power plants.
Coal emits more greenhouse gases than oil, gas, and coal-fired power plants combined.
And the EWG found that, even though coal plants emitted more carbon dioxide in 2012, the average amount of CO 2 that coal produced was slightly higher than in 2010.
Coal use has dropped across the board.
The biggest declines were seen among the Midwest, West, and Northeast, the report found.
In all, the study shows, coal emissions have fallen by nearly 3 percent since 2000, while CO 2 emissions from power generation have increased by 4.7 percent.
The decline in coal use is likely the result of a combination of changes in technology and policies, the researchers found.
For instance, more efficient technology has made coal more efficient, but that has also made the plant more expensive to operate.
Coal-fired plants are also now less costly to build.
The U.K. Energy and Climate Change Agency recently announced that it would phase out coal in the country’s power sector by 2026, and by 2020, all U. S. coal plants would be shut down.