Keeling Curve
Charles David Keeling's measurements provided the first significant evidence of increasing atmospheric carbon dioxide concentration in the atmosphere.
It’s Official: 2012 is Hottest U.S. Year on Record
A snapshot of how 2012 stacks up against the five other warmest years ever recorded in the U.S.
Autumn is on the Move
If it seems like autumn leaves are taking longer to change color, you’re not imagining things. Over the past 25 years, the onset of autumn has shifted.
Lightning-Caused Wildfires
As the graphic shows, people cause most wildfires. But lightning-ignited fires burn by far the most territory.
2012: Warmest March Ever Recorded
You knew it was warm last month, but today it’s official: it wasn’t just warm; it was the warmest March ever recorded in the U.S.
Pollen Searches are on the Rise
Online searches for the word “pollen†have gone through the roof this spring, and if you know anyone with seasonal allergies (and who doesn't?) this isn’t surprising.
Spring Comes Early Across the U.S.
The Lower 48 as a whole had an average shift of “first leaf†from March 20 (1951-1980 average) to March 17 now (1981-2010 average) – approximately 3 days earlier.
Warming Winters in the U.S.
A graphical look at the way winters have changed in the United States between 1895 and 2010.
