"The frequency of marine heat waves-- which can kill fish, seabirds, coral reefs, and seagrasse
"The frequency of marine heat waves-- which can kill fish, seabirds, coral reefs, and seagrasses-- have doubled since the 1980s."
Source: https://www.nytimes.com/2019/09/25/climate/climate-change-oceans-united-nations.html?campaign_id=60&instance_id=0&segment_id=17306&user_id=db9af844d7e6e1e47474affdf44c8746®i_id=62883805ing-news