How we know carbon dioxide in the atmosphere is increasing — and it's our bad.
Recent human activity is having such a significant environmental impact on the planet that we may be entering a new geologic epoch, known as the Anthropocene.
As the Arctic melts, the ground may release half again as much carbon dioxide as humans have created through fossil-fuel burning in the past few hundred years.
A new study highlights 180 regions in the U.S. where sea level rise is likely to have a major impact. Here are photos of the 20 cities with populations over 300,000 which are likely to be affected.
The American Wind Energy Association claims wind power is largely cost competitive with natural gas. But what does "competitive" really mean?
This winter has featured unusually cold and snowy conditions in the Lower-48 states, with much milder than average conditions in the Arctic.
A new study says that melting snow and ice cover in the Northern Hemisphere is causing more warming than computer models predicted.
Researchers using different techniques have arrived at a similar conclusion: 2010 was a remarkably warm year. But did it set a new record?