Environmental issues pose challenges. What are the biophysical and social causes of environmental change? What exactly is an environmental issue and why are they often controversial and difficult to resolve? How can we make a difference? You will address all of these questions as you explore four key global environmental concerns – life, water, carbon, and food – through a rich and interactive set of study materials. As you do so, you will develop a distinctive way of thinking about environments and environmental issues that draws on the insights of both natural and social sciences to be at once intellectually innovative and practically relevant.