While carbon dioxide streams into the atmosphere from tailpipes and smokestacks around the world, one man is building a machine to suck it back out. And some heavy-hitting investors are betting that it's going to work.
This summer has been the second-hottest ever recorded in the United States, pushing power demands to record levels. To some, the country's growing reliance on air conditioning puts it at risk of a vicious circle: cooling down by burning energy — which raises emissions levels.
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