Environment News Service: Emissions produced by human activities have caused annual monsoon rainfall to decline over the past 50 years, new research has found.
In the second half of the 20th century, the levels of rain recorded during the Northern Hemisphere`s summer monsoon fell by as much as 10 percent, according to researchers at the University of Edinburgh.
The scientists determined that emissions of tiny particles from human activities, known as anthropogenic aerosols, were the cause.
Levels of aerosol emissions...