Everybody is talking about

Global warming

but rarely you hear about Global Dimming.
When we calculated the effects of greenhouse gases in the 1980ties and compared our findings with reality, we found differences. Some people told us, that all these calculations were nonsense.
But for many years now, our calculation are much more accurate - WHY?
We had to calculate in a different factor:
Global Dimming
Visibility on clear days has declined on Earth since the 1970s because of a rise in airborne pollutants.
"Global Dimming" can be clearly seen in over south and east Asia, South America, Australia and Africa, while visibility remained relatively stable over North America, except Los Angeles, and improved over Europe.