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Don't invest unless you're prepared to lose all the money you invest.

This is a high-risk investment and you should not expect to be protected if something goes wrong. It's very stressful to spend an entire day in a plane flying over, say 200 reefs, all of which are severely bleached.

Earlier this month,

the National Oceanic and Atmospheric Administration

and the International Coral Reef Initiative

confirmed that the world's fourth planet-wide mass-whoral bleaching event is

underway. Over the past 14 months scientists have documented significant

bleaching in every major ocean basin.

Some say that as already record-breaking sea surface temperatures continue to rise

this is on track to become the worst mass bleaching event ever recorded.

This is science quickly, and I'm Megan Bartels.

Joining me is Terry Hughes, a marine biologist at James Cook University in Australia.

Thanks so much for joining us.

Could you start by just telling us why coral reefs are such important ecosystems?

Yeah, coral reefs are an absolutely critical ecosystem to many hundreds of millions of people

...