Today, campers, we’re going to talk about global warming. If you already believe in that, you can go play outside―or stay and watch the show, if you like, but this is specifically aimed at those who don’t think the planet is changing temperature. In fact I’m going to break my normal practice and refer directly to my skeptical audience as “you.”
Before we get started, a few definitions. What I mean by global warming―more properly termed climate change or climate chaos―is the average temperature of our planet climbing, generally because of an increase in carbon dioxide in the atmosphere. The “greenhouse effect” has been pretty well proved by the example of Venus, which is in fact warmer than Mercury due to carbon dioxide.
Note that I say nothing of what’s causing this increase in CO2. That’s because the effects of the increase are much the same regardless of whether it’s a natural process or man-made. Many people have pointed out that the recent increases in CO2 levels and average temperature are well within the extremes that Earth has experienced, according to the geologic record. This is true… but irrelevant, here. Continue reading