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quote:Originally posted by Andrew K FletcherGlobal warming is here. In the U.K. we have just introduced a hosepipe ban on the Eastern Side of the country. This is during what should be our rainy season.
quote:Reduced air pollution and increased water evaporation appear to be adding to man-made global warming. Research presented at a major European science meeting adds to other evidence that cleaner air is letting more solar energy through to the Earth's surface. Other studies show that increased water vapour in the atmosphere is reinforcing the impact of man-made greenhouse gas emissions. Scientists suggest both trends may push temperatures higher than believed. But they say there is an urgent need for further research, particularly at sea. Dimming no more Between the 1950s and 1980s, the amount of solar energy penetrating through the atmosphere to the Earth's surface appeared to be declining, by about 2% per decade. This trend received some publicity under the term "global dimming". But in the 1980s, it appears to have reversed, according to two papers published last year in the journal Science. The decline in Soviet industry and clean air laws in western countries apparently reduced concentrations of aerosols, tiny particles, in the atmosphere. These aerosols may block solar radiation directly, or help clouds to form which in turn constitute a barrier; or both effects may occur. The lead researcher on one of those Science papers was Martin Wild from the Institute for Atmospheric and Climate Science (IACETH) in Zurich, and this week he has been discussing the implications of those findings at the European Geosciences Union (EGU) annual meeting in Vienna.
quote:Originally posted by another_someoneI don't know that anyone questions that global warming is happening, the issue is to what degree does human activity have an impact upon it.Global temperatures dropped to a minimum in the middle of the 17th century, after having reached a high around the 11th century. This is a natural cycle, not anything to do with humans. The only dispute is whether human activity has exaggerated that cycle.George