NOAA and NASA provide visual perspectives on our environment
NOAA Environmental Visual Laboratory gives an visual perspective on the earth’s global temperature changes, dead zones and the impact humans have had on our environment.
http://www.nnvl.noaa.gov/
Learn how to make a change in our environment for the better by taking action
http://www.earthday.net/
NASA provides interesting images of the earth: http://www.nasa.gov/topics/earth/earthday/