Are wild animals getting more aggressive? Recent attacks on humans suggest that global warming is bringing the natural world uncomfortably close.
Surfer’s leg found after shark attack
Horror: Kai McKenzie, 23, (above) was attacked by a 10-foot great white shark as he surfed near Port Macquarie, a small town about 200 miles from Sydney, Australia. Glossary
Rewilding - Returning developed or farmed land to its natural state by reintroducing species that once lived there.
Invasive species - A non-native species that causes harm to an existing ecosystem by overpowering other species or bringing new diseases, usually after being introduced because of human activity.