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Why is Geoengineered Cooling Bad and Untested if We Have Been Doing it With Sulfur Dioxide Air Pollution for Decades?

A report in Nature says that China’s sulfur dioxide air pollution has been geoengineering earth cooling by up to 0.7 degrees celsius for decades. China reduced sulfur dioxide emissions from its power plants by 7–14% between 2014 and 2016. Mainstream climate models had expected China’s air pollution to increase. Lower pollution is better for crops and public health. China has over 1 million deaths from the particulate air pollution that also comes with the sulfur dioxide air pollution. But aerosol air pollution, including sulfates, nitrates and organic compounds, reflect sunlight. This shield of aerosols has kept the planet cooler, possibly
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