I didn't need to read the book to realize that flying around in a jet-fuel burning jet, or staying in a hotel where they launder my sheets each day and I use a brand-spanking-new mini-soap every morning might not have the best environmental impact. Not to mention the other dire statistics I'm sure were included about the impact on developing nations of safaris and other fun trips.
Here is the thing. We recycle. We have a compost bin. I put my green peppers right into the shopping cart rather than into the extra plastic bag provided in the produce section. I buy the hand soap in the huge jug and refill all the soap dispensers in our bathrooms, then recycle the big jug once it's empty. It's not like I don't care about the environment. But. I freaking LOVE going to a hotel and unwrapping those little soaps to wash my face each day. LOVE IT. Which brings me right to the cornerstone of my views on activism: Do what is easy first.
(picture of soap from a Seattle hotel from here,
which also poses an interesting solution to the mini-soap problem)