Okay, if you REALLY want to learn more about degrowth, here is your opportunity: a 700-page thesis titled "The Political Economy of Degrowth" by Timothée Parrique (@timparrique), an ecological economist at Lund University in Sweden.
I haven't read the whole thing yet, only parts of it, but I really liked this bit from the Introduction...
Of all the diverse quirks and oddities one finds among human societies, the fact that the infinite accumulation of money has been heralded as the supreme road to prosperity does not raise many eyebrows, especially among economists. If there is a problem with economic growth, it has to do with not having enough of it — growth for employment, growth against poverty, growth for enjoyment, growth against inequality, growth for state welfare or against international warfare — the more growth, the better.
But what is the point of growth if it fails to deliver on its promises while jeopardising hospitable conditions for life on Earth? This is the paradox that motivates the present study: it is precisely what we desire most that is the root cause of our ills. The system is not in crisis, it is thriving, and that is what should get us worried. Put differently, “growth is not in crisis, it is the crisis.”