Human activity has been linked with a too quickly changing climate. The problem may be a defining issue for this moment in time, but it seems to be similar to a Zen Koan, an insoluble puzzle. The idea of the koan is not to be solved, but for it to tire the mind until it dissolves. If human activity is part of the problem, maybe less activity is a good idea. My mind is tired. I believe I’ll have a nap.