For a population of field mice in overshoot, the critical resource might consist of small plants whose unusually robust growth has been triggered by … - Richard Heinberg

Our core ecological problem is not climate change. It is overshoot, of which global warming is a symptom. Overshoot is a systemic issue. Over the past century-and-a-half, enormous amounts of cheap energy from fossil fuels enabled the rapid growth of resource extraction, manufacturing, and consumption; and these in turn led to population increase, pollution, and loss of natural habitat and hence biodiversity. The human system expanded dramatically, overshooting Earth’s long-term carrying capacity for humans while upsetting the ecological systems we depend on for our survival. Until we understand and address this systemic imbalance, symptomatic treatment (doing what we can to reverse pollution dilemmas like climate change, trying to save threatened species, and hoping to feed a burgeoning population with genetically modified crops) will constitute an endlessly frustrating round of stopgap measures that are ultimately destined to fail.

As we’ve grown our population and our per capita consumption rates, we’ve been taking habitat away from other organisms. As a result, nature is in full retreat. Vertebrate and invertebrate animal species have suffered average population declines of 70 percent in the past 50 years, and thousands of plant species are endangered as well.

Thank you, Peter, for... this important and timely book. ...I’ve been following your work for several years, and I discussed it in my own recent book, Power: Limits and Prospects for Human Survival. The data-driven, mathematical methods you and your colleagues have developed for understanding patterns in history seem highly illuminating. In the U.S., rising economic inequality (since the 1970s) has immiserated the working class, while the number of elites (e.g., billionaires) and elite aspirants (e.g., people with law degrees) has skyrocketed. As you show... these developments align with a historical pattern seen repeatedly in complex societies, and... never seems to end well. In End Times, you lay out... what your analysis means for the United States in the 2020s. It’s not a pretty picture. ...we’re seeing the evidence of increasing polarization and political ill will everywhere.