In this age of climate change, killer germs, and obesity, it's easy to feel as if we've fallen out of synch with the global ecosystem. This ecological anxiety has polarized a new generation of Americans: many are drawn to natural solutions and organic lifestyles, while others rally around high-tech development and industrial efficiencies. Johnson argues that both views, when taken to extremes, can be harmful, even deadly. Johnson, raised in the crunchy-granola...