A snapshot of how 2012 stacks up against the five other warmest years ever recorded in the U.S.
If it seems like autumn leaves are taking longer to change color, youÃ¢Â€Â™re not imagining things. Over the past 25 years, the onset of autumn has shifted.
As the graphic shows, people cause most wildfires. But lightning-ignited fires burn by far the most territory.
The Lower 48 as a whole had an average shift of Ã¢Â€Âœfirst leafÃ¢Â€Â from March 20 (1951-1980 average) to March 17 now (1981-2010 average) Ã¢Â€Â“ approximately 3 days earlier.
A graphical look at the way winters have changed in the United States between 1895 and 2010.
A visual look at six plant species that are already being affected by climate change.
Different groups of scientists use different methods to track global surface temperatures, but the data shows the same warming trend.
Lake Mead is at a record low level, a stark symbol of increased water demand and a stubborn drought in the West. Will conditions persist and the reservoir sink farther? Scientist David McGee reveals how he looks for the answers by studying past dry spells.