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The worst are wars imo. Massive usage of resources to build war machinery, massive destruction of infrastructure that used resources to build, massive usage of resources to clean up and rebuild… And it’s usually not accounted for: https://www.scientificamerican.com/article/warfares-climate-emissions-are-huge-but-uncounted/
This one definitely does not get enough time in discussion, especially with so many active wars in the world currently.