Climate change has increased pollen counts and the length of the pollen season, trends that are expected to continue through mid-century.
Spring is arriving earlier across the U.S. by an average of three days.
If global warming continues unabated, only 6 of the 19 previous host cities could host the Winter Games again by the 2080s.
The 10 warmest years on record globally have all happened since 1998, with 2010 still on top as the warmest of all.
For the first time in 20 years, the U.S. is on track to set more record lows than record highs in 2013.
This season was the least active since 1982 and the sixth-quietest since 1950.
The amount of carbon dioxide in the atmosphere has a strong correlation with rising temperatures.
As the globe continues to warm, it is already having an effect on the jet stream and corresponding weather patterns.