Climate change. It’s bad, and it’s getting worse. The main cause is burning fossil fuels, which spews CO2 into the atmosphere. Carbon dioxide, as we all know too well by now, is a greenhouse gas, meaning it absorbs heat radiation from the Earth, preventing it from escaping out into space.
A certain amount of this is good—without CO2 the Earth would be so cold, the oceans would freeze. But in preindustrial times the concentration of CO2 in the atmosphere was about 280 parts per million. Now it’s 420 ppm, or 50 percent higher. (You might be surprised to know that CO2 is only 0.04 percent of the air we breathe,
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