-- Last month was the hottest May on record and marked the 13th consecutive month to break global temperature records, according to the National Oceanic and Atmospheric Administration.
"Make no mistake, climate change is no longer a threat, it’s a reality,” Obama said, stressing the need for action. "On this issue, unlike a lot of issues, there's such a thing as being too late."
May 2016 was 1.57 degrees Farenheit (0.86 degrees Celsius) above average for the month, according to NOAA's data. Many scientists believe it is important to restrict warming to below 2 degrees Celsius (3.6 degrees Farenheit), a point that could trigger catastrophic changes to the Earth's environment.