Agriculture enabled population growth and social complexity, but it gradually robbed soils of nutrients. Sailing ships guided with clocks and navigat… - 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.

For a population of field mice in overshoot, the critical resource might consist of small plants whose unusually robust growth has been triggered by high levels of rainfall. For humanity currently, the critical resource is fossil energy. Temporary energy abundance has led to many good things (for some of us, anyway): more food, more people, more commercial products, more knowledge, more comfort, and more convenience. But we are about to become victims of our own success.

The past few thousand years of human history have already seen several critical accelerators. The creation of the first monetary systems roughly 5,000 years ago enabled a rapid expansion of trade that ultimately culminated in our globalized financial system. Metal weapons made warfare deadlier, leading to the takeover of less-well-armed human societies by kingdoms and empires with metallurgy. Communication tools (including writing, the alphabet, the printing press, radio, television, the internet, and social media) amplified the power of some people to influence the minds of others. And, in the past century or two, the adoption of fossil fuels facilitated resource extraction, manufacturing, food production, and transportation, enabling rapid economic expansion and population growth. Of those four past accelerators, our adoption of fossil fuels was the most potent and problematic. In just two centuries, energy usage per capita has increased eightfold, as has the size of the human population. The period since 1950, which has seen a dramatic increase in the global reliance on petroleum, has also seen the fastest economic and population growth in all of human history. Indeed, historians call it the “Great Acceleration.” Neoliberal economists hail the Great Acceleration as a success story, but its bills are just starting to come due. Industrial agriculture is destroying Earth’s topsoil at a rate of tens of billions of tons per year. Wild nature is in retreat, with animal species having lost, on average, 70 percent of their numbers in the past half-century. And we’re altering the planetary climate in ways that will have catastrophic repercussions for future generations. It’s hard to avoid the conclusion that the whole human enterprise has grown too big, and that it is turning nature (“resources”) into waste and pollution far too quickly to sustain itself. The evidence suggests we need to slow down, and, in some cases at least, reverse course by reducing population, consumption, and waste.