> Stop it. Please. No. Nitrogen pollution has local effects and is an enormous problem in some important fish spawning grounds, but it cannot explain what happ

> Stop it. Please. No. Nitrogen pollution has local effects and is an enormous problem in some important fish spawning grounds, but it cannot explain what happened to the Great Barrier Reef in 2018 and again in 2019. The effects of temperature on corals are getting to be quite well understood now. Globally, marine heat waves are a major problem, alongside pollution and direct reef destruction. Likewise, ocean acidification is happening as part of "climate change" (carbon pollution) and is another stress for corals. I agree with your point about N runoff. We need to stop growing maize for biofuels and animal feed and implement megascale riparian planting programmes to limit the damage done by floods. For starters. These things are not either-or. Overfishing and destructive fishing practices, "development", various kinds of pollution and oxygen depletion ... we're doing it all, and it all affects reefs.