A snapshot of how 2012 stacks up against the five other warmest years ever recorded in the U.S.
A look at which states were hit hardest by extreme climate and weather events in 2011.
In a forested state like Montana, hotter and drier years leave forests more susceptible to large wildfires.
Volatile precipitation patterns, with heavy rains followed by drought, can lead to ideal conditions for wildfires in some states.
With drought, increasing water consumption, and climate change, the Colorado River Basin Ã¢Â€Â” lifeblood of the Southwest Ã¢Â€Â” appears headed for a day of reckoning.
Glen MacDonald, of UCLA, talks about the threat of drought in the Southwest and what it means for water supply.
The average temperature in Moscow during June, July and August 2010 was significantly hotter than any year since 1950.
The average temperature in Moscow during July 2010 was significantly hotter than any year since 1950.