A volcanic eruption in the south Pacific could temporarily make global warming worse. The undersea volcano put a large amount of water vapor into the stratosphere. Water is a greenhouse gas.
https://www.nbcnews.com/news/world/tonga-volcano-eruption-warm-earth-rcna49084
30+ years ago, the European economies and the spillover of their industrial, airborn effluents contributed to Saharan, and sub-Saharan droughts. This was confirmed via satellite imagery of the German effluents travelling southeast.
I only post this to point out that there is a lot going on in the atmosphere. Some of it man-made and some because of nature. There has been a lot of data about the disruption caused by volcanic discharges. None of this is news.
Norm.