Introduction of substances or other agents that cause harmful environmental change; the relevant effect depends on the agent, exposure and system.
A substance or other agent contributing to pollution. Its effect cannot generally be inferred from the human biological population alone.
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If your pollution damages the property of others, that would violate the NAP, and a minarchy would be justified in collecting penalties for the same and distributing them to the people affected. This should incentivize the company to try and prevent or clean up its pollution as much as possible. We need to decide the extent of such penalties, and whether penalties other than monetary ones would be even more effective at preventing pollution.