WHILE 2018 WAS THE 4TH WARMEST YEAR ON RECORD IN THE ATMOSPHERE, IT WAS THE WARMEST YEAR ON RECORD IN THE OCEANS, AS WAS 2017 AND 2016 BEFORE THAT. RECORDS FOR OCEAN WARMING HAVE BEEN BROKEN ALMOST EVERY YEAR SINCE 2000... AN ESTIMATED 93% OF ALL HEAT TRAPPED BY GREENHOUSE GASES SETTLES IN THE WORLD'S OCEANS.