After 2009's dip in carbon emissions caused by the world economic crisis, levels hit a record high last year.
Frequent periods of intense global warming took place in the distant past, say researchers at UC San Diego's Scripps Institution of Oceanography.
Is it penance for all those old Chevrolet/GM gas-guzzlers still on the road? Forward-looking environmental stewardship? Basic good-neighborliness?
A combination of all three?
Scientists have been surprised to discover that Martian sand dunes long thought to be static are in fact changing quite fast.
The Cassini-Huygens mission has identified an oxygen-carbon dioxide atmosphere around Saturn's second-biggest moon, Rhea - the first time a spacecraft has captured an oxygen atmosphere from a world other than Earth.
A new study from the National Center for Atmospheric Research and other bodies aims to quantify the effects of population growth on carbon dioxide emissions, and concludes that it could make a big difference.
There's been liquid water on the Martian surface throughout the planet's history, measurements by NASA's Phoenix Mars Lander suggest.
Porsche AG is likely to price its hybrid 918 Spyder at a cool $630,000.
Carbon dioxide has been the main factor controlling global temperatures for millions of years, according to a new study.
US concern over global warming is starting to rise again - good timing, perhaps, as the US Senate prepares to vote this week on whether to block the EPA from regulating carbon dioxide as a pollutant.
Scientists think they've found the source of a huge carbon dioxide 'burp' which helped to end the last ice age 18,000 years ago.
UK researchers reckon they are on track to take carbon dioxide from the air and turn it into car fuel.