Imagine your home at its most peaceful moment. The television and stereo are off. You and your computing devices are in blissful slumber. The dishes are clean and dry, and the laundry is done for the week. Everything is still, except for one thing: the electricity meter.
Thanks largely to our burning of fossil fuels, the average carbon dioxide concentration of the earth’s atmosphere surged past 400 parts per million in March. It has been a long time since the planet experienced such CO2 levels. How long?