Polution only appears within 3 tiles of the offending city; we only have to worry about AI cities very close to our borders causing polution inside our territory.
What's messured world wide that could cause harmful effects on us is global warming, but ire-irrigating a tile with irrigation that was changed via global warming is much cheaper than clearing polution.
What's messured world wide that could cause harmful effects on us is global warming, but ire-irrigating a tile with irrigation that was changed via global warming is much cheaper than clearing polution.
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