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Global Dimming

  1. Fossil Fuels Cause Global Warming and Global Dimming (
      "Two effects of fossil fuel productions are:

      * Greenhouse gases that cause global warming

      * By-products which are pollutants that cause global dimming" 04-06

  2. Global Dimming: Description (
      "Global dimming is a term describing the gradual reduction in the amount of global hemispherical irradiance (or total solar irradiance) at the Earth's surface since the 1950s. The effect varies by location but worldwide it is of the order of a 5% reduction over the three decades 1960-1990; the trend has reversed during the past decade. Global dimming creates a cooling effect that may have led scientists to underestimate the effect of greenhouse gases on global warming."

      "Some scientists now consider that the effects of global dimming have masked the effect of global warming to some extent and that resolving global dimming may therefore lead to increases in predictions of future temperature rise." 04-06

  3. Global Dimming: Evidence (
      "In the early 21st century, it's become clear that air pollution can significantly reduce the amount of sunlight reaching Earth, lower temperatures, and mask the warming effects of greenhouse gases. Climate researcher James Hansen estimates that "global dimming" is cooling our planet by more than a degree Celsius (1.8F) and fears that as we cut back on pollution, global warming may escalate to a point of no return." 04-06


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