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US energy-related carbon emissions dropped 12 percent last year, compared with 2005 levels, after increasing in 2013 and 2014, according to the US Energy Information Administration (EIA). Reduced energy-sector C02 emissions in 2015 are largely due to a decreased use of coal and increased use of natural gas in the electricity mix, the EIA says. Such fuel-use changes have accounted for 68 percent of total energy-related CO2 reductions from 2005 to 2015.

U.S. energy-related CO2 emissions from natural gas are expected to exceed CO2 emissions from coal by 10% by the end of 2016, according to a U.S. Energy Information Administration report.

New data released by the U.S. Energy Information Administration also highlighted another potential contradiction: Virtually every state suing to block the Clean Power Plan has itself shifted toward burning less coal to generate the electricity its residents need since the year 2007 - in some cases by very large amounts.

The US could cut its carbon dioxide emissions 20% more by using the Clean Power Plan, according to the Energy Information Administration. The report said carbon dioxide emissions from coal-burning power plants have been declining for a decade, but the nation could further accelerate that shift by employing the CPP. Rice University Associate Professor Daniel Cohan argues that the report emphasizes the importance of the ongoing litigation over the CPP and how far the US still has to go to meet its greenhouse gas emissions targets.

Thanks to the U.S. fracking boom, the world is coasting on a wave of cheap natural gas. As far as official forecasts suggest, that wave should last for decades to come. But a new analysis that takes a higher-resolution look at shale gas suggests that wave could crash far sooner than producers expect. And with the rest of the world anticipating cheap American gas, a crash could sends shocks rippling across borders