The story of insects

Insects: We live on and share a planet with them. They make up around 70 percent of all known species on Earth, and they're an incredibly diverse group of organisms. But scientists say many are struggling. Why are insects so crucial to life on Earth, and should we be taking better care of them? Dave Goulson is Professor of Biology at University of Sussex, and author of the book, 'Silent Earth: Averting the Insect Apocalypse'.