Charles David Keeling's measurements provided the first significant evidence of increasing atmospheric carbon dioxide concentration in the atmosphere.
A snapshot of how 2012 stacks up against the five other warmest years ever recorded in the U.S.
From Hurricane Sandy to record heat, here is our list of the top 10 extreme weather and climate events of 2012.
Human-generated emissions of CO2 this year are expected to reach 35.6 billion tons. That’s up 2.6 percent from what was emitted in 2011, the previous record holder.
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.
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.
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.
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.