Dave Montgomery posits that soil degradation has determined the lifespan of past civilizations. At the rate that plowing erodes soil it takes about 1000 years

Dave Montgomery posits that soil degradation has determined the lifespan of past civilizations. At the rate that plowing erodes soil it takes about 1000 years to deplete the resource to the point of desertification. https://www.youtube.com/watch?v=sQACN-XiqHU https://www.youtube.com/watch?v=sQACN-XiqHU