USA takes the lead as per usual.
How and Why U.S. Greenhouse Gas Emissions Are Falling
Recent data clarify the trends causing emissions to shrink to their lowest level since 1995.
By Mike Orcutt on May 6, 2014
WHY IT MATTERS
Greenhouse gas emissions, in the U.S. and elsewhere, need to come down significantly by 2020 to avoid the worst consequences of climate change.
Greenhouse gas emissions in the United States fell to their lowest level in 17 years in 2012, according to a new report from the Environmental Protection Agency. Additional data from the U.S. government show why: the trend is largely the result of a rapid drop in coal-fired electricity, and a corresponding rise in electricity generated by cleaner fuels, especially natural gas.
The picture is less encouraging globally.
Although a report by Reuters shows that greenhouse gas emissions in industrialized nations fell by 1.3 percent in 2012, with the biggest drop being seen in the United States, energy-related carbon dioxide emissions still rose 1.4 percent worldwide that year, according to a recent report by the International Energy Agency.
Natural Gas Fuels the Recent Drop in U.S. Greenhouse Gas Emissions | MIT Technology Review