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So what exactly is a fuel cell, anyway? Why are governments, private businesses and academic institutions collaborating to develop and produce them? Fuel cells generate electrical power quietly and efficiently, without pollution. Unlike power sources that use fossil fuels, the by-products from an operating fuel cell are heat and water. But how does it do this?

The Next Generation of Digital Books Our Choice will change the way we read books. And quite possibly change the world. In this interactive app, Al Gore surveys the causes of global warming and presents groundbreaking insights and solutions already under study and underway that can help stop the unfolding disaster of global warming. Our Choice melds the vice president's narrative with photography, interactive graphics, animations, and more than an hour of engrossing documentary footage. A new, groundbreaking multi-touch interface allows you to experience that content seamlessly. Pick up and explore anything you see in the book; zoom out to the visual table of contents and quickly browse though the chapters; reach in and explore data-rich interactive graphics.