Salmon swim upstream in Seattle in 2017. A mass of abnormally warm water off the West Coast of the U.S. that year contributed to a federal fishery disaster. Warming oceans and rising sea levels are threatening coastal economies as the world’s climate changes.

Salmon swim upstream in Seattle in 2017. A mass of abnormally warm water off the West Coast of the U.S. that year contributed to a federal fishery disaster. Warming oceans and rising sea levels are threatening coastal economies as the world’s climate changes.