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.
More water is flowing this year in California from frequent storms and melting snowpack.
Western snowpack at the end of the the wet season is up this year — but that's less likely in the future.
Snow cover in North America is on the decline in part due to climate change.
See how snowfall is trending in these U.S. cities.
Extreme cold is decreasing, as the lowest temperature observed each year is trending upward.
Globally, 2016 was the hottest year on record. That makes three years in a row of record setting heat.