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