Brief Sketch On Global Dimming2006 November 13, 10:50 pm
Global Dimming, is the gradual decrease in sunlight and solar radiation. It can be generally considered to be the opposite of Global Warming.
Evidence have shown that the amount of sunlight reaching the Earth’s surface has decreased by 10 percent over the past decades and the trend is still in continuation. The decreased sunlight is due to Sulphur emissions and other particle that make clouds more reflective. Thus, reflecting solar radiation back into space. In fact, it could be the reason as to why the global temperature statistics are contradicting scientist’s prediction.
With so much pollution occurring, we would have expected a significant increase in global temperature. However, contrary to predictions, parts of the Northern Hemisphere, such as Britain, there has been a reduction in solar radiation.
This would then account for the low rising global temperature. In other words, Global Dimming has been masking the true effects of Global Warming; the computer models that predict a 5 degrees Celsius temperature increase in global temperature by the end of the century might be understated by twice the amount!
Despite the significance and age of the finding, it has not been well-known, due mainly to one factor -it goes against current orthodoxy. Therefore, it had been doubted and disputed by scientists.
However, increasing evidence has been unearthed to support the finding. Perhaps, we will only know to what extent the damage is, once the IPCC has finished its first report on Global Dimming, due in 2007.
Note: The above information is just a brief sketch of what I understand of the situation. As such, there may be mistakes made. I still am trying to find out more. If you are interested, follow the sources of authority below. Not forgetting the IPCC reports.