On this 44th Earth Day we speak with Paul Ehrlich, the President of the Center for Conservation Biology and a Professor of Population Studies at Stanford University. We discuss the state of a planet beset by a record level of CO2 in the atmospheres, the worst in over a million years, and one that is facing projections that the earth’s current population of over seven billion will reach 9 billion by 2050, placing unsustainable pressure on food supplies already threatened by environmental degradation and global warming.
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