https://sci-hub.st/10.1029/2020GL089788
https://sci-hub.st/10.1029/2020JD033108
This review uses traceable and arguable lines of evidence, supported by aerosol studies published over the past 40 years, to quantify that uncertainty. It finds that there are two chances out of three that aerosols from human activities have increased scattering and absorption of solar radiation by 14% to 29% and cloud droplet number concentration by 5 to 17% in the period 2005–2015 compared to the year 1850. Those increases exert a radiative forcing that offsets between a fifth and a half of the radiative forcing by greenhouse gases.
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019RG000660
https://www.nature.com/articles/d41586-019-01791-6
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