Groundhog shadow or not, spring has been trending earlier in the U.S.
2017 was globally the third-warmest year on record. See the rest of the top 10 here.
2017 was the third-warmest year on record in the U.S.
As the world warms, snow cover in North America is on the decline.
Daily record highs are dramatically outpacing daily record lows in the U.S. in the last 20 years.
Here's where winters are warming the most across the U.S.
U.S. sales of plug-in electric cars increased by a factor of 8 from 2011 to 2016
Transportation recently overtook electricity generation as the biggest source of greenhouse gases in the U.S.