The amount of carbon dioxide in the atmosphere has a strong correlation with rising temperatures.
Since the first Earth Day in 1970, the average annual temperature in every state has climbed.
Warming winters may sound great at first, but they bring new problems.
Extreme cold is decreasing, as the lowest temperature observed each year is trending upward.
Climate change is altering important elements affecting fall foliage.
The annual Arctic sea ice minimum extent has been below average every year since 2002.
September 10 marks the statistical peak of the Atlantic hurricane season.
April 2016 was the hottest April on record globally.