Negative feedback: reversing carbon emissions
It is increasingly clear that putting less carbon dioxide in the atmosphere will not be enough to combat climate change; we take a look at the effort to actively remove the stuff from the air. Our correspondent takes a ride on Chicago\u2019s Red Line, whose length represents a shocking level of inequality. And why a push to go organic in Turkey isn\u2019t everyone\u2019s cup of tea. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer
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