Current floods in Midwestern states is a preview of what forecasters expect for the rest of the spring, the National Weather Service says.
In 1987, countries around the world agreed to phase out chlorofluorocarbons, and emissions fell. But in 2013, a study shows, they began rising again around China, Mongolia and the Koreas.
Global warming took surface temperatures in 2017 to near-record levels, while the upper oceans reached their hottest known level.
Scientists say 2017 was the hottest year on record without an El Nino boosting temperatures naturally.
The nation had 16 disasters last year with damage exceeding a billion dollars each, the National Oceanic and Atmospheric Administration reports.
The panel was about to issue a report on the role of human activities in global temperature increase from 1951 to 2010.
The scientific evidence for global warming has never been clearer, yet the Republican presidential nominee boasts that he can't wait to tear down President Obama's positive environmental actions.