Colorado's air-quality regulators this week will consider a plan for the state's 18 largest manufacturers to reduce their greenhouse gas emissions, but it's running into sharp criticism from legislators and environmentalists who are concerned about a loophole that could allow companies to buy their way out of making cuts.
Greenhouse gases include carbon dioxide, methane, nitrous oxide and fluorinated gases that trap heat in the atmosphere. They can linger in the atmosphere for years, accelerating global warming as they accumulate.
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