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The EPA is cracking down on a renegade solar geoengineering startup.

The Environmental Protection Agency is demanding answers from controversial start up Make Sunsets about its attempts to cool the planet down by releasing reflective particles into the atmosphere. The company started launching sulfur dioxide-filled balloons in the US after Mexico banned its efforts.

Environmental advocates have also criticized solar geoengineering as a risky distraction from legitimate efforts to stop climate change by getting rid of greenhouse gas emissions from fossil fuels.

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