By John Keefe andRachel Ramirez, CNN
Updated 1656 GMT (0056 HKT) October 12, 2021
(CNN)The planet is warming rapidly, resulting inhistoric droughtdeadly floodsand unusualmelting eventsin the Arctic. It is also causing steady sea level rise, which scientists saywill continue for decades.
A new study from Climate Central, a nonprofit research group, shows that roughly 50 major coastal cities will need to implement unprecedented adaptation measures to prevent rising seas from swallowing their most populated areas.