Local AI models are not more efficient than corporate ones - you might not need as much energy as a datacenter for cooling, but the actual GPUs and the software that runs on them are similar enough that the necessary enery per image is effectively the same.
Stable Diffusion might be open-source software by some definition of the word, but it was trained on mostly the same unlicensed data as the commercial models, so using it is still plagiarism.
If you don't want to be mistaken for techbros, you might want to avoid parroting their talking points.
Intuitively I would assume that a single event would either not release enough energy to start a feedback loop or destroy the planet altogether, but I have no idea how to calculate that.
In some regions of Germany, beer wasn't traditionally as common as you might expect. By watering down wine, you get a beverage with a similar alcohol content like beer which you can drink in similar contexts - for example, it's not a great idea to drink undiluted wine when you're sitting outside on a hot summer day
I don't think making semiconductors at home is explicitly illegal anywhere, but I doubt hobbyists can legally buy or synthesize many of the chemicals you'd need
Hydrologists find water is wet