A new study finds ocean temperatures surged to their highest level on record last year, in another clear sign that human activity is warming the planet. Researchers publishing in Advances in Atmospheric Sciences found the top two kilometers of ocean water gained about 10 zettajoules of heat energy in 2022 — equivalent to 100 times the world’s annual electrical power production. Warmer ocean temperatures are tied to heat waves, droughts, more powerful hurricanes, and extreme weather events like recent flooding in California.