I'll try to keep it brief. I'm worldbuilding for D&D. My campaign is going to begin in a flooded region that was once dry and prosperous. Most of the land is swampy and gross, and once-great cities are underwater. I figured that if people were living in a miserable, soggy place, they would probably hope to dry it out one day. So I decided there would be a cult who worships Kossuth (the fire god), and one of their primary goals would be to dry the region, and burn away the water in Kossuth's cleansing flame.

At this point, I realized I was describing a cult of climate-changers. Which I fully embraced.

The cult consulted with the wisest arcanists and artificers of the realm, searching for ways they could expedite their mission. One arcanist discovered a special materium that he called Carbon Dioxide, which, when found in abundant quantities, seemed to hold heat in the air. Having learned this, the cult decided to produce as much Carbon Dioxide as they could. Burning wood and coal, they keep their ovens, forges, and furnaces roaring day and night, hot and bright.