For all its terrifying urgency, climate change is an invitation — to reinvent our economies, to rethink consumption, to redraw our relationships to nature and to one another. Cultivated meat was an excuse to shirk that hard, necessary work. The idea sounded futuristic, but its appeal was all about nostalgia, a way to pretend that things will go on as they always have, that nothing really needs to change. It was magical climate thinking, a delicious delusion.