There's a famous quote that says "anyone who thinks that endless growth is possible in a finite world is either crazy or an economist." It's a simple thermodynamics question, right? Every activity that humans do as part of our economy transforms energy and material in ways that create entropy. And when there's a balanced cycle of a re-generation of resources and what we call nature, that's fine. But when we accelerate and grow economies to the point where we're transforming more and more energy every day, burning more and more fossil fuels, cutting down more trees, mining more minerals, the entropy gets out of control, causing disequilibrium in Earth's systems. Everyone's heard about climate change, but also biodiversity collapse, ocean acidification, loss of fresh water, desertification, are results of these Earth system shifts that are provoked by this excess entropy that is a direct result of the economic activity of humans, of certain humans, of the wealthiest humans on Earth.
Latin Americanist Susan Paulson talks about strategies for degrowth and how to achieve more buy-in for the concept from a broader amount of people.