Large scale changes in weather patterns may also have been caused by global dimming.

Other scientists have also reported signs that global dimming halted in the 1990's.

The phenomenon underlying global dimming may also have regional effects.

Global dimming is harming the water cycle of the earth.

On the other hand, global dimming is affected by evaporation and rain.

Global dimming also causes the earth to cool down.

One of the possible causes of global dimming is pollution.

The dynamics of global dimming are not completely understood.

But this "global dimming" occurred so slowly that even scientists examining the data didn't believe it for years.

Another possible explanation is global dimming due to atmospheric aerosols.

Global dimming is the slow decrease in the irradiance at the Earth's surface.

The findings, being reported today in the journal Science, add a new level of mystery to the recent debate about "global dimming" and its causes.

Known as global dimming, the decrease is estimated to have been about 4% between 1960 and 1990 although the trend has subsequently reversed.

Global dimming - the observed decrease in surface insolation, that may have recently reversed.

The downward trend of pan evaporation has been linked to a phenomenon called global dimming.

The output of the Sun varies only slightly, so scientists theorize that global dimming probably results from air pollution.

The phenomenon of global dimming is widely known, and is not necessarily a geoengineering technique.

Over the course of the 20th century, evaporation rates have reduced worldwide; this is thought by many to be explained by global dimming.

Reversing a decades-long trend toward "global dimming," Earth's surface has become brighter since 1990, scientists are reporting today.

Global dimming may have disturbed the global water cycle by reducing evaporation and rainfall in some areas.

It is thought that global dimming is probably due to the increased presence of aerosol particles in the atmosphere caused by human action.

Most governments of developed nations have taken steps to reduce aerosols released into the atmosphere, which helps reduce global dimming.

The majority of recent global dimming has been in the troposphere, except that resulting from volcanos, which affect mainly the stratosphere.

See global dimming.

Some scientists believe that jet engines are also a source of global dimming due to the water vapour in the exhaust causing cloud formations.