Once confined to the small scientific community of climate researchers and ecological economists, the idea of degrowth is now blazing into the mainstream. Not surprisingly, people are trying to figure out what to make of it. Is it an inspiring idea that points the way to a better economy? Or is it a mad notion that’s sure to plunge us all into poverty? Degrowth is a planned reduction of total energy and material use to bring the economy in line with planetary boundaries, while improving people’s lives by distributing income and resources more fairly. The scientific case for degrowth is...