This week, we're looking at how worldwide environmental challenges interact with our increasingly global economy. We'll speak to Amy Larkin, founder of Nature Means Business, about her book "Environmental Debt: The Hidden Costs of a Changing Global Economy." Journalist Ken Silverstein joins us to explain the way climate change is dividing the insurance and energy industries. And we'll talk to Arjen Hoekstra, professor of Water Management at the University of Twente, about the effects of water scarcity on business.