Climate scientists focus on extracting the carbon already in our air

For decades, most of the strategizing about how to slow down climate change has focused on cutting emissions of carbon dioxide and other greenhouse gases, mainly by shifting away from fossil fuels. Other proposals range from reducing meat consumption (cattle belch massive quantities of methane, a potent greenhouse gas) to curtailment of chlorofluorocarbons (compounds that both retain heat and destroy atmospheric ozone) in refrigerants and aerosols.

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