From the link

"Surface measurements of solar radiation found a global trend of dimming from 1960 which reversed around 1985. From that point, there has been a general trend of brightening. As solar output has been steady over this period, this is consistent with measurements of aerosol levels that have fallen since the early 80's. Note - this doesn't explain current warming but does explain why CO2 warming has been masked from 1950 to 1980."

Questions - Do you know:

1. What do they mean by solar output: solar irradiance, solar magnetic field, or solar wind?

2. What is cause of global changes of atomospheric aerosols?

Thanks for any input.
TomT