On Earth Day 2013: 13 excellent books to consume

It's Earth Day. Check out these 13 books for the literary equivalent of a green boost of antioxidants and protein.

7. "The World Without Us," by Alan Weisman

What if humans suddenly experienced a mass extinction? Read this book as a flight of fancy rather than a prophecy, though that flight is well-researched and compellingly told. Weisman imagines the slow decline of cities, speculating as to which animals would take our place at the top of the food chain, and envisioning what would happen to the environment without us. He also tries to provide solutions to many of the environmental problems that his book focuses on.

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