If we all--all seven billion of us--got serious about reversing global warming today, change would not come overnight.
This is the reality David Orr presents in his book Dangerous Years: Climate Change, the Long Emergency, and the Way Forward.
He demonstrates the ways in which Earth is becoming a different planet from the one many of us knew.
But there's some optimism in the book, too: Orr does not believe we're fated to destroy Earth.
He explains in a conversation on The Exchange.