A brief foray into a moral thicket, exploring why we should protect nature despite tsunamis, malaria, bird flu, cancer, killer asteroids, and tofu. Most of us think that in order to be environmentalists, we have to love nature. Essentially, we should be tree huggers--embracing majestic redwoods, mighty oaks, graceful birches, etc. We ought to eat granola, drive hybrids, cook tofu, and write our appointments in Sierra Club calendars. Nature's...