Proceedings of the National Academy of Sciences

A new study reveals two findings on air pollution spewing from China's coal-burning factories. First, the pollution blows to the U.S and other nations. Second, 20% of the pollution can be traced to Western demand for cheap goods from those factories.
Jan 22, 2014   Los Angeles Times - Science Now
The EPA has seriously underestimated the emissions of the powerful greenhouse gas, methane, particularly from oil and gas activity (five times) and from cattle and livestock operations (two times), according to a new report published in the PNAS.
Dec 6, 2013   The New York Times
How much methane, a powerful but short-lived greenhouse gas is released during fracking operations for natural gas? Until now, all studies, including those by the EPA, were done by estimates. This study went to over 500 well sites to measure leaks.
Sep 19, 2013   The New York Times - U.S.
A new study published in the Proceedings of the National Academy of Sciences shows how population growth increases greenhouse gas emissions. More importantly, two demographic factors shape the increase, urbanization and aging -with opposite effects.
Oct 25, 2010   BBC News - Science & Environment