Read here. Scientists know that atmospheric aerosols including dust, secondary organic material from terrestrial biogenic emissions, carbonaceous particles from wildfires, and sulphate from marine phytoplankton dimethyl sulphide emissions have a significant impact on the climate. A group of researchers find that the climate feedback from these type of aerosols is often the opposite of greenhouse gases but are not well researched, leading to their exclusion from climate models.
"...they state that these aerosols "have a significant effect on many components of the Earth system, such as the atmospheric radiative balance and photosynthetically available radiation entering the biosphere, the supply of nutrients to the ocean, and the albedo of snow and ice.....The seven scientists report that "the number of drivers of change is very large and the various systems are strongly coupled," noting that "there have therefore been very few studies that integrate the various effects to estimate climate feedback factors." Nevertheless, they say that "available observations and model studies suggest that the regional radiative perturbations are potentially several Watts per square meter..... And, more often than not, the aerosol-induced perturbations are of the opposite sign of those produced by CO2, methane and other greenhouse gases.....arriving at the ultimate conclusion that "the level of scientific understanding of the climate drivers, interactions and impacts is very low" in this particular realm of pertinent science."