Consider these examples, some of which we discussed earlier: the Treaty on the Non-proliferation of Nuclear Weapons; the Montreal Protocol outlawing CFCs; the invention, trialing, and rollout of a polio vaccine across a Cold War divide; the Biological Weapons Convention, a disarmament treaty effectively banning biological weapons; bans on cluster munitions, land mines, genetic editing of human beings, and eugenics policies; the Paris Agreement, aiming to limit carbon emissions and the worst impacts of climate change; the global effort to eradicate smallpox; phasing out lead in gasoline; and
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