The coral reefs are another huge problem. Most fish species spend some time of their life in one, and a staggering amount have been destroyed. Last year I volunteered for a few hours at a coral nursery, they said 90% of coral has been destroyed[1] since the 70s. I'm not sure if they meant just barrier reefs,just around Florida, or everywhere, but in any case it's already a disaster.

[1] I tried to Google to verify that number and found a bunch of different numbers with different qualifiers.