The podcast and article that follow expresses opinions not necessarily shared by the Cortes Radio Society, its board, staff, volunteers or membership.

Editor’s note: Reality 101 with Rex Weyler was one of the lunchtime lectures at Cortes Island’s Folk University. This session was recorded and broadcast over Cortes Radio in the regular Cortes Currents slot on November 6, 2019. The theme is overshoot, and what this means to the future of humanity and our planet. Rex also writes about overshoot in the article below; the embedded podcast is Rex’s Folk U presentation.

Originally published on Cortes Currents

I’m in Vancouver, riding the skytrain, the metro-region’s elevated and underground public transport system. In a crowded cabin, I gaze above the seats and see this advertisement: 

“By 2050 sea levels have risen. Would you rather: 

  • A: Build higher dikes to fight it?
  • B: Develop underwater transit technology to embrace it?

Reality 101

Reality 101 with Rex Weyler: a lunchtime lecture from Folk University for Cortes Island
Reality 101 with Rex Weyler
Slide from the Folk U presentation Reality 101 with Rex Weyler

Embracing Technology

There is no “C: Change your lifestyle to prevent it.” This little ad is a pitch by Metro Vancouver’s transportation authority, TransLink. They clearly want the public to choose “underwater transit technology” since this means bigger budgets for them. They dress up this choice with the hot term “technology” and invite us to “embrace” this. They don’t mention that dikes also require “technology,” and they certainly don’t mention the taboo topic of changing lifestyles. 

Embracing the crisis with technology feels good, it means growing our economy, advancing, having more, not giving up anything. This blind spot remains our deep, unspoken problem. We want to solve the ecological crisis and the humanitarian crisis, economic growth and “technology,” without changing our lifestyles. We want it all.

Avoiding The Root Problem

Problem is: We’re avoiding the root problem and the genuine solutions. The climate crises, biodiversity crisis, and all other ecological challenges are symptoms of the larger, deeper problem: Ecological Overshoot, more humans with more expectations than Earth can sustain. No species can grow out of overshoot. All genuine solutions to our ecological dilemma must include a contraction of human scale. We must relinquish our expectation of endless economic growth. However, this appears as the one solution ignored by most people, governments, corporations, and even many environmentalists. 

 Slack In The System

Finding an effective way to discuss human scale as a fundamental problem, is one of the most difficult challenges I’ve faced as an ecologist. People find the topic uncomfortable. The idea of living with less conflicts with our notions of unlimited human ingenuity, destiny, human rights, and human specialness. We find it difficult to admit that even with all our technological wonders, we are animals, subject to the biological and physical limits of our habit.  

Modern ecologists have known and described ecosystem limits for decades, highlighted by the 1972 Limits to Growth study. Capitalist economists, however, mocked the idea that there exist any limits to human economic growth. In the 1980s, U.S. President Ronald Reagan claimed, “There are no such things as limits to growth, because there are no limits to the human capacity for intelligence, imagination, and wonder.” The denial feels appealing. 

Reality 101 with Rex Weyler
Example of animal population overshoot – the reindeer population on St Matthew Island – from Reality 101 with Rex Weyler

Talking About The Limits

This long-standing taboo against talking about the limits of human growth, however, is beginning to crumble, even within the mainstream media. Last month, the Financial Times, published an article by Harry Haysom, “The Myth of Green Growth,” in which he states that, “green growth probably doesn’t exist.” As we build out our renewable energy infrastructure, he suggests, we need to simultaneously contract our economies and consume less material and energy. 

The US magazine Newsweek recently published an essay by Michael Shank, who teaches sustainable development at New York University: “This Controversial Way to Combat Climate Change Might Be the Most Effective.” Shank encourages worldwide family planning to solve the ecological crisis. 

Vaclav Smil, Professor Emeritus of Environment at the University of Manitoba, Canada, is considered among the world experts in energy transitions. His recent book, “Growth: From Microorganisms to Megacities,” describes an “irreconcilable conflict between the quest for continuous economic growth and the biosphere’s limited capacity.”   

Example of human population overshoot: Easter Island – from reality 101 with Rex Weyler

All biological habitats are finite, all plants and animals reach individual maturity, and all natural communities reach collective maturity. Predators grow until they deplete their game, then they die back. Lake algae will grow until they deplete the available nutrients, then die back. Ecosystems reach a “climax status” and endure in “dynamic homeostasis” until some catastrophe collapses the balance. 

Growth Swamps Efficiency 

Smil considers the idea that we can “decouple” economic growth from material throughput “total nonsense.” History shows that when human enterprise becomes more efficient with a resource, we use more of that resource, not less, a phenomenon known as the “rebound effect” in economics or “Jevon’s paradox,” in mechanical engineering. 

In the 19th century, more efficient machines did not reduce coal consumption, but increased coal consumption. In the 20th century, computers did not save resource, as some technology optimists predicted, but rather sped up the economy, leading to greater resource extraction. As the rebound effect predicts, even with myriad modern efficiencies, we have burned through the best stores of coal and oil, and are now digging into the dirty, low-grade shale oil and tar sands. When Europeans first came to North America, they could pick up copper nuggets the size of watermelons from stream beds. Now, to supply modern electronics, we have to dig giant pits 4-kilomters in diameter and a kilometer deep to scrape out low grade ore that contains as little as 0.2% copper. Limits don’t necessarily mean that we “run out” of a resource, but that the quality declines as costs and ecological impact. 

Reality 101 with Rex Weyler
How humans and our animals have taken over the planet – from Reality 101 with Rex Weyler

Smil emphasizes that we are now coming face-to-face with the real limits of human scale. “That’s our major problem,” he writes, “scale.” Humans and their livestock now comprise 96% of all mammal biomass on Earth. That is a problem of scale. Our climate crisis, our biodiversity crisis, our depleted soils, and humanitarian crises, are all symptoms of the unrealistic scale of human enterprise. 

Accept The End Of Overgrowth

Smil argues that for the forlong-term survival of civilization, we have to accept the “end of growth.” We cannot engineer our way out of the contradiction or reconcile planetary constraints with un-restrained human aspirations.We must abandon the idea that we can take marginal baby steps. We require, he writes, a “radical … bold vision …  fundamental shifts, and unprecedented adjustments.”

Smil believes we could  achieve this shift because of the tremendous “slack in the system.” The rich world wastes so much energy, materials, and food, that we could vastly reduce our material and energy use simply by avoiding waste. 

Reality 101 with Rex Weyler
Humans overshooting the earth’s capacity – from Reality 101 with Rex Weyler

The industrial agriculture system, for example, dumps vast quantities of toxic pesticides into our soils, burns millions of gallons of diesel fuel, disrupts Earth’s nutrient cycles with ammonia and fertilizers, and then wastes 40 percent of the harvest. This is the “slack” in the system that that could be used to help us reduce consumption. 


The tiny home and shared office movements are a positive response to the massive waste in our private and public buildings. Smil calculates that if all buildings were optimum size and well insulated, we could save about 20 percent of our carbon emissions. “But people aren’t willing to do it,” he warns. “People want to have it all, giant houses with circular staircases, which are not properly insulated. They want to have their SUVs and raspberries in January. That’s the problem.”

Furthermore, household energy consumption cannot be reduced simply with efficiency, because of the increase in home size. According to William Rees at the University of British Columbia, since 1950, new US homes have grown from about 1000 ft2 to over 2500 ft2 while the number of people per home has dropped from 3.4 to 2.5 people. In 70 years, the floor area per person has grown 240%. Meanwhile, since 1950, the US population has doubled and world population has tripled. Any marginal gains in energy efficiency have been swamped by growth. 

Reality 101 with Rex Weyler
How the future will look if we continue – from Reality 101 with Rex Weyler

Smil believes we could address our ecological crisis by taking advantage of this “slack … the large margins for improvement …  subsidized insulation retrofits .. down-sizing the household, duplex conversions, [and] public transit accompanied by limiting private cars.”

Population: The Last Taboo

In the Newsweek essay, Michael Shank states that stabilizing and reducing human population is “a necessary conversation that we can’t keep avoiding.”  

In “The Last Taboo,” written nine years ago in Mother Jones, Julia Whitty wonders: “There are 7 billion humans on earth, so why can’t we talk about population?” She reports that scientists working on ways to address population often face “harassment.” However, says Whitty, “Voiced or not, the problem of overpopulation has not gone away.” 

Reality 101 with Rex Weyler
Adding Renewables – from Reality 101 with Rex Weyler

Solution To Ecological Overshoot

“The only known solution to ecological overshoot,” writes Whitty, “is to decelerate our population growth .. and eventually reverse it [and] reverse the rate at which we consume the planet’s resources. Success in these twin endeavors will crack our most pressing global issues: climate change, food scarcity, water supplies, immigration, health care, biodiversity loss, even war.” 

Fortunately, we do not need to resort to draconian laws to reverse population growth. Scientists studying the data tell us that the most effective population action is to establish universal women’s rights and universally available contraception. Everywhere those goals are achieved, the birth rate plummets. 

Slowing or reversing population growth would also help elevate humanitarian challenges. “The trial ahead” Whitty writes, “is to strike the delicate compromise between fewer people, and more people with fewer needs.”

In “The Myth of Green Growth,” Harry Haysom proposes that societies divert money from consumption to building green infrastructure, which he points out has been one of Greta Thunberg’s arguments.

There are plenty of studies demonstrating that after basic needs are met, more income and consumption do not necessarily create more happiness, and often create more stress and anxiety. 

Arne Naess, who founded the deep ecology movement fifty years ago, put it this way: “Richer lives, simpler means.” Regardless of what else we propose to solve our ecological crisis, the time has come that we must act to reduce the scale of humanity’s footprint on Earth. It is time for Plan-C: Change our lifestyle. 

Reality 101 with rex Weyler
The solution – from Reality 101 with Rex Weyler


  • Vaclav Smil, “Growth: From Microorganisms to Megacities,” MIT Press, 2019. 
  • Vaclav Smil, “The Long-Term Survival of Our Civilization Cannot Be Assured,” New York Magazine, Sept. 2019. 
  • David Wallace-Wellsinterview with Vaclav Smil, “We Must Leave Growth Behind, New York Magazine, Sept. 24, 2019.
  • “The Myth of Green Growth,” Harry Haysom, Financial Times, Oct 23, 2019. 
  • William Catton, “Overshoot: The Ecological Basis of Revolutionary Change”, University of Illinois Press, 1982.
  • Donella Meadows, et. al., “Limits to Growth” (D. H. Meadows, D. L. Meadows, J. Randers, W. Behrens), 1972; New American Library, 1977.
  • “Renewables 2019: Status Report,” Renewable Energy Policy Network for the 21st Century (REN21).
  • Gunders, Dana. “Wasted: How America is Losing Up to 40 Percent of Its Food from Farm to Fork to Landfill.” Natural Resources Defense Council, 2017. 
  • Chris Huber, “World’s food waste could feed 2 billion people,” World Vision, 2017. 
  • “Why Is Population Control Such a Radioactive Topic?” Population Forum, Mother Jones, 2010.  
  • Julia Whitty, “The Last Taboo,” Mother Jones, June 2010.
  • David Clingingsmith, “Negative Emotions, Income, and Welfare,” Department of Economics, Case Western Reserve University, September 2015

Podcast photo – courtesy Folk U