Sharks: Four facts you probably didn't know

Do you know how many sharks are killed by humans each year?

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- Here are some quick facts you probably didn't know about sharks. Humans kill around 100 million sharks a year. But globally, there's only an average of 10 human deaths caused by sharks each year.

Over 1/3 of shark species are now threatened with extinction. The biggest threats to sharks are overfishing, habitat loss, and climate change. Follow Yahoo Australia for more environmental facts.