Record High Ocean Temperatures and 6 Things to Watch for During El Niño.

The oceans have been record-warm for the past four years, and global sea surface temperature climbed to a new high in mid-March. El Niño is on its way starting this summer, and it could push the world past 1.5 degrees Celsius of warming above pre-industrial levels. El Niño could bring severe and unprecedented impacts for many parts of the world, including extreme heat, dangerous tropical cyclones, and a significant threat to fragile coral reefs. It could also amplify droughts, fierce heatwaves, and dangerous wildfires in some countries.