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.
In 2006, wildfires burned seven million acres in the West, the equivalent area of five of the country's largest national parks.
In a desert state like Nevada, heavy rains promote plant growth but can lead to more wildfires.
In a forested state like Montana, hotter and drier years leave forests more susceptible to large wildfires.
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.
The Copenhagen Diagnosis is a major climate change report released on November 24, 2009. Key findings in the report include that climate-related changes are happening faster than scientists expected only a few years ago and that the average scientific projection for sea level rise has increased sharply.