Nova's video Earth from Space - 2 hours
This is a must-see video for grades 3-12. It shows images of the Earth from space through 7 different spectrums of light, each one revealing astonishing truths about the condition of the Earth.This is a perfect lead-in to all Ecology lessons because it shows the "big picture"and helps the students draw some important conclusions that will inspire interest, concern and hopefully, activism for the environment. It would be best to watch this 2 hour video in 2-3 sessions.
Click http://player.pbs.org/viralplayer/2334144059/ link to open resource.