On my recent Amtrak trip between Tucson, AZ and Alpine, TX, I caught up on some reading. The highlight of that reading was an article by Alexandra Witze entitled “A Planetary Crisis” in the March 12, 2022 issue of Science News (pp. 16-24). This is absolutely the best article I have ever read about the history of our scientific knowledge on the topic of human-induced climate change.
You can read the print edition of this article, or the version online.
One important point to call out. The Mauna Loa Observatory in Hawaii has been continuously monitoring atmospheric CO2 levels since March 1958, and the annual mean CO2 level has increased 31.8% between 1959 and 2021.
| 1959 | 315.98 ± 0.12 ppm |
| 2021 | 416.45 ± 0.12 ppm |
(micromol/mol = parts per million = ppm)
And, most recently,
| May 2021 | 419.13 ppm |
| May 2022 | 420.99 ppm |
Alarmingly, the rate of increase is not linear.
We know that carbon dioxide is a potent greenhouse gas. And, as Witze’s article explains, that fact has been known since 1856.
One thing is crystal clear. Human activity (mostly the burning of fossil fuels) is causing the increase in the atmospheric concentration of carbon dioxide, and that is causing our planet to warm. We need to quickly and substantially reduce the amount of CO2 we are dumping into the atmosphere—or risk catastrophic consequences. I’m trying to do my part. We just installed rooftop solar panels that should generate most or all of the electricity we consume, including that required to power an electric car. As soon as I can get one (this fall?), I will be trading in my gasoline-powered car for an electric one.
By the way, I’ve been a subscriber to Science News for the past 50 years, and in my opinion there is no better newsmagazine covering all areas of science. If you aren’t already a subscriber, please consider becoming one.