When journalists talk about climate change, they are usually talking about the man-made kind. There may be more important contributors, however, like cosmic radiation and solar output variations possibly affecting the rate of cloud formation on Earth. If you've ever seen a cloud chamber, you might get the idea. Physicists at CERN have been doing experiments to test this hypothesis. The Wall Street Journal has an unpaywalled opinion piece summarizing this research. As usual, more research is needed, but the results so far are interesting.
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