身边的经济学·社会常识英语30篇（1）
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How a Ton of CO₂ Got a Price Tag
碳交易为什么存在
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Carbon trading turns pollution into something you can buy, sell, or limit—like grain or oil.
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Governments set a total cap on emissions for power plants or factories, then give or auction permits.
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Each permit allows one ton of CO₂ release; companies that pollute less can sell spare permits to others.
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This creates a clear financial reason to invest in cleaner machines—even if they cost more up front.
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Unlike flat bans or vague promises, carbon markets use price signals to guide decisions across industries.
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Critics point out loopholes—like giving free permits to big polluters—or weak caps that don’t cut emissions fast enough.
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But in places like the EU, emissions dropped faster after the system launched than in countries without it.
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At its heart, carbon trading says: ‘If you use shared air, you should pay for the cost you create.’