Regulations and a natural gas boom have helped reduce America's CO2 emissions to their lowest level since 1994. But CO2, and plenty of other toxic particles, continue to pollute our urban air. Brentin Mock looks at 5 highly polluted urban areas.
Oct 29, 2013 Grist
The concentration of carbon dioxide in the Earth's atmosphere is fast approaching levels not seen for millions of years. At 400 parts per million (p.p.m.), the planet is fast approaching the point of no return for avoiding dangerous climate change.
May 1, 2013 Nature
A new study by the Reason Foundation evaluates wind power and finds that wind power is limited in practice due to the increased need for power storage, the decrease in grid reliability, and the increased operating costs.
Oct 8, 2012 Reason Foundation
The first four months of 2012 saw 'energy-related, CO2 emissions' drop to levels not seen since 1992, according to the EIA. Graphs show an 18% decrease in carbon emissions from coal, with lesser amounts from natural gas and petroleum from a year ago
Aug 6, 2012 Reuters - U.S.
New research suggests that huge domes of carbon dioxide hover over urban areas, which is prompting some scientists and policymakers to stress the importance of cities as the frontlines of the war on greenhouse gas emissions.
Mar 18, 2010 Grist