These are the CASSE blog articles on materials use.


Two Cheers for Circularity

by Gary Gardner

Here’s some bad news for folks who see a circular economy as a way out of the polycrisis: Trends in global materials use, which recently bent modestly in the direction of circular flows, are flattening once again. The Circle Economy Foundation in Amsterdam reported in January that secondary materials amounted to only 7.2 percent of all materials in the global economy in 2023, down from 9.1 percent in 2018.


How to Avoid the Scarcity Scare

by Gary Gardner

In congressional testimony last November, Isabel Munilla, an official from the Department of Energy, gave an alarming assessment of U.S. reliance on foreign minerals. For 31 of 50 critical minerals, she warned,”…the U.S. relies on other countries for more than 50 percent of our requirements…Our reliance on non-allied foreign sources for these materials is neither sustainable nor secure.” Munilla employed what we might call the “scarcity scare”—the panic that supplies of critical minerals may be insufficient for all nations to participate in the transition to clean,


Time to Make a Material Difference

by Gary Gardner

Well, COP 28 ended yesterday with (seeming) agreement to (sort of) walk down the fossil fuel ladder toward a (not for a while) sustainable future. Geez! It’s almost 2024, more than half a century since Limits to Growth was published, and the human family is in a pouting mood. Why is it like pulling teeth to do the right thing, sustainability-wise? Why are we sleepwalking toward a cliff?


Which Future?

by Gary Gardner

One of the more puzzling features of modern life is the starkly contrasting visions of humanity’s near-term future. Watch thirty minutes of commercial-filled TV and you get a cheery sense that all is well in the world. A BMW, an anti-depressant, or a Caribbean vacation—these will ensure ever greater happiness.

At the same time, a 2021 poll in ten countries found that four in ten young people are hesitant to have children because of the climate crisis.


Tons, Hectares, or Dollars? Measuring the Pressure Exerted by the Economy on the Biosphere

by Gregory M. Mikkelson

Like a doctor measuring a patient’s vital signs, environmental scientists use various indicators to assess the health of the global ecosystem. These planetary vital signs are reckoned in a variety of units, such as tons of greenhouse gas emitted or hectares of land deforested. Meanwhile, conventional economists try to measure everything in terms of dollars (or other currencies). For example, they assign monetary values to the “ecosystem services”


Bulldozing the Planet

by Gregory M. Mikkelson

Just as it does for a certain “old man on a green bike,” my commitment to car-free travel often drives me to greater levels of exercise, and more vivid experiences of nature, than one would get behind the wheel of a car. Unfortunately, economic growth has progressively degraded one such experience. Trips to my partner’s lake cottage begin with a commuter train in Montréal and end with an hour-long walk on a dirt road through the countryside.