It’s a simple enough question — would you rather get into a sea that has a lot of sharks in it or be given a big bag of money?

Very few are going to choose the sharks. But over the long term you can’t have an ocean emptied of its sharks and a healthy economy at the same time. These animals are not only a keystone species, which means they’re vital for keeping marine ecosystems in balance, they also tell us about how coral reefs are doing, how robust deep-sea environments are, what the impact of destructive fishing methods is and how much bycatch fishing companies are hauling in, to name just a few headline items...

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