Earth’s Sustainability: Good News and Bad

Today, more people than ever before face real threats from food shortages, water scarcity, and environmental pollution. As the world's population continues to grow, will changes in the global environment mean even more people will find their health and well-being threatened? Today on Focus, we'll talk human health and security with Jonathan Andrew Foley, Professor of Atmospheric & Oceanic Sciences and Environmental Studies at the University of Wisconsin.