Let's assume that at some point in the near future our society makes the smart choice of turning toward degrowth. Yay!
That still would mean, however, that a certain level of heavy industry will be required. We can't feed and house and clothe and provide health care for eight billion people without producing at least some steel and some plastics. That's just reality.
So, what are the best alternatives for rapidly reducing carbon emissions while also managing to keep everyone alive?