Three Physical Requirements for Life on Earth: Clean Air, Clean Water, and _____ _____
History tells us that war, politics, disease, deforestation, and drought have all contributed to societal collapses that punctuate human history. But there is another factor of at least equal importance. In fact, Wes Jackson of the Land Institute is persuaded that it may pose a more serious threat to human life than does climate change. Yet, we rarely think about it. This morning we will.