GLG 115: Environmental Geology

America has more than 130,000 lakes of significant size. Ninety percent of all Americans live within fifty miles of a lake, and our 1.8 billion trips to watery places make them our top vacation choice. Yet despite this striking popularity, more than 45 percent of surveyed lakes and 80 percent of urban lakes do not meet water quality standards. For Love of Lakes weaves a delightful tapestry of history, science, emotion, and poetry for all who love lakes or enjoy nature writing.

Philadelphia's place as an early seat of government and major American metropolis has been well documented by leading historians. Now, Nature's Entrepôt looks particularly to the human impact on this unique urban environment, examining its long history of industrial and infrastructure development, policy changes, environmental consciousness, and sustainability efforts that would come to influence not just this region but also the nation.

Over the last half a billion years, there have been five mass extinctions, when the diversity of life on earth suddenly and dramatically contracted. Scientists around the world are currently monitoring the sixth extinction, predicted to be the most devastating extinction event since the asteroid impact that wiped out the dinosaurs. This time around, the cataclysm is us. The sixth extinction is likely to be mankind's most lasting legacy; as Kolbert observes, it compels us to rethink the fundamental question of what it means to be human.

An icon of the environmental movement outlines a provocative approach for reclaiming our planet According to Stewart Brand, a lifelong environmentalist who sees everything in terms of solvable design problems, three profound transformations are under way on Earth right now. Climate change is real and is pushing us toward managing the planet as a whole.