Environmental and ecological discussion, particularly of things like weather and other natural phenomena (especially if they're not breaking news).
See also our Nature and Gardening community for discussion centered around things like hiking, animals in their natural habitat, and gardening (urban or rural).
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I know an old person in a tropical country. A few months ago she started having blood pressure issues so her doctor put her on about 3 or 4 different medications. They didn't help very much.
Then about a month ago she got air-conditioning in one of the rooms of her house. Boom, blood pressure problems all solved immediately.