Orr describes how political negligence, an economy based on the insatiable consumption of trivial goods, and a disdain for the well-being of future generations have brought us to the tipping point that biologist Edward O. Wilson calls "the bottleneck." Due to our refusal to live within natural limits, we now face a long emergency of rising temperatures, rising sea-levels, and a host of other related problems that will increasingly undermine human civilization.