Sally Neas wrote this article for YES! Magazine. Sally is a freelance writer and community educator based in Santa Cruz, California. She has a background in permaculture, sustainable agriculture, and community development, and she covers social and environmental issues. She blogs at www.voicesfromthegreatturning.com.
The model developed by the physicists depicts human population growth reaching a maximum level that is undermined by the shrinking of forests, which will not have enough resources left to sustain people.