Earth Newslink: What Is Global Dimming?

What is global dimming?
Measurements from the 1960s to the early 1990s, backed up by a wide range of data and a number of independent studies, showed there were substantial declines in the amount of the sun's energy reaching the Earth's surface. This reduction is known as "global dimming.

Full article at The Guardian: https://www.theguardian.com/environment/2012/may/11/global-dimming-pollution