Ecological Footprint quizzes
1) http://www.footprintnetwork.org/en/index.php/gfn/page/calculators/
2) http://www.myfootprint.org/
Happy Earth Day
Book is called Earth by Yann Arthus Bertrand
http://www.amazon.com/Earth-Above-Third-Yann-Arthus-Bertrand/dp/081095947X
Astronomy Picture of the day- http://apod.nasa.gov/apod/astropix.html