I think it's erosion. If we're talking about geology.
Is a source of international conflict because, as it falls downwind, the area in which it accumulated is not necessarily the area that will be damaged. So countries must work together to reduce the problem because they are damaging one another's environments.
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just read this from khan academy says we need to be on the lookout for when we, too, become used to the casual oppression of others, when our everyday compassion for people different from us disappears
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