Rising ocean temperatures and increasing acidification are threatening coral reefs. Between 2009 and 2018, the world's reefs lost 14% of their corals. By 2025, 84% of the oceans' reefs have been affected by bleaching, meaning they've been so stressed by the changes to their environments that they've expelled all the algae living inside them, turning them white. As climate change worsens, coral loss is expected to speed up. Corals are also threatened by activities like fishing and tourism.
The national study combined 20 years of data from 35 community science programs across the country, including the Butterfly Pavilion's Colorado Butterfly Monitoring Network.