Government climate scientists will study two geoengineering proposals to counteract global warming. The top climate change scientist for NOAA said he has received $4 million from Congress and permission from his agency to study two emergency methods to cool the Earth if the U.S. and other nations fail to reduce global greenhouse gas emissions. One is to inject sulfur dioxide or a similar aerosol into the stratosphere to help shade the Earth from more intense sunlight. The second approach would use an aerosol of sea salt particles to improve the ability of low-lying clouds over the ocean to act as shade.
By John Fialka. E&E News/Scientific American. January 23, 2020.