Startups want to geoengineer a cooler planet. With few rules, experts see big risks.
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@Scott Duncan: Wait for it...Our planet is pulsing warmer and warmer. 2020 will serve as a stark reminder that our climate is continuing to rapidly change.Each bar of colour represents a month of global temperature as we loop through 140 years of data from 1880 to 2020.[THREAD] pic.twitter.com/geNg2kDeYd