The Huffington Post wrote an article about the best books one can read to celebrate Earth Day. Many people do many things to celebrate Earth Day. One way to do so is to pick up a book and become more aware of the day and the meaning of the day.
Here are some suggestions for you:
Silent Spring by Rachel Carson
Eaarth: Making a Life on a Tough New Planet by Bill McKibben
World on the Edge: How to Prevent Environmental and Economic Collapse by Lester R. Brown
The World Without Us by Alan Weisman