National Public Radio: Ecologist Jon Foley says agriculture is the "most powerful force unleashed on this planet since the end of the ice age." He says we're using too much of it to irrigate, and we have to rethink how we farm.
About Jon Foley
Jon Foley focuses on the complex relationship between global environmental systems and human civilization, using computer models to analyze changes in land use and resources around the world. Foley is the executive director of the California Academy of Sciences, where he heads...