The human population of the world currently uses just under 50% of the total photosynthetic capacity of the Earth. This is not good.
This is a video dealing with the affects of the population boom associated with agriculture and civilization. It is another unusual take from Nina Paley and is posted for free on Google Video and is free to watch.
Another one of Nina Paley’s gems. In this one she puts another atypical spin on things. This time, her target is the fertility companies. It is hosted by the The Voluntary Human Extinction Movement. It takes some time to load, but is worth the wait.