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The key to your questions is to realize that having rulers exacerbates any societal problems you might see, because they're just going to let their cronies loot and pillage and pollute as they please, as long as they receive adequate bribes - that's why they went into politics after all. Would people do something about "Megacorp Inc" raping the world, if they didn't think it was their rulers' job to stop it? But here's a realistic idea anyway: https://en.wikipedia.org/wiki/Dispute_resolution_organization