New Zealand’s coastal waters have once again warmed to reach “marine heatwave” conditions – raising the chances of another major ocean event and scorching days this summer, NZ Herald reveals. Marine heatwaves are becoming increasingly frequent in a warmer climate, but while balmier seas might be good for beachgoers, heatwaves have also proven to have severe impacts on ocean ecosystems and our industries that rely on them. Already, Niwa was picking 2021 to be among New Zealand’s five hottest years on record.