Luiz Rocha, California Academy of Sciences
Last year, ocean temperatures were the highest they've been since scientists started keeping track in the 1950s.
According to a new study, the oceans have absorbed the heat equivalent of 3.6 billion Hiroshima bomb explosions over the last 25 years.
Warmer oceans can kill coral, fish, and seabirds.
Higher ocean temperatures also cause sea levels to rise, leading to coastal flooding and more severe hurricanes.
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