Lots of the Great Barrier, and other reefs are dieing. In other words places, they are probably growing as cool water warms. Since reefs provide protection from storms and waves and such loss of the reefs loses the insurance against storms. Like losing mangroves; the coastline is more vulnerable. Also, the reef-dependent animal life reduces/disappears.

Not "our" problem because we aren't Australia. But losses in the Caribbean will affect the US.

Fall is the best time for outdoor pursuits, I agree.