This lecture is a very good overview of our current environmental challenges and potential solutions. Lester Brown is an environmentalist with experience and training in the field of agronomy. He brings an amazingly well-informed perspective to issues related to food production and energy. In this talk he discusses the big picture side effects of corn-based ethanol, the great potential of wind and solar hot water, and encouraging examples of the emerging new green economy. The video is a bit long (over an hour) but well worth the time. Let me know what you think.