Rip Esselstyn's (auther of the Engine 2 Diet) new book My Beef With Meat is easy to understand and doesn't take a lot of time to read. It is very similar to my book Sick Of Being Fat, it even has some of the exact same information, yeah! The main difference is that my book focuses on a whole lifestyle adjustment for better health and environmental awareness and Rip Esselstyn's book is a winning argument about animal products and the negative impacts raising and eating animals have on health and the environment.
If you are considering going Paleo, read this book first, it will change your mind!
Both books (Sick Of Being Fat & My Beef With Meat are available at Amazon.com)