When talking global warming and climate change and all the causes I have a question. With all the pollution in the air and different types what, if anything, happens to the atmospheres reflection ability of sunlight? Are the pollutants reflecting in any way, meaning less sunlight or less intense rays reaching the surface or do pollutants magnify the intensity of the rays or is just no effect at all? Also NASA's ICESat has now showed that 70 percent of the earth is covered by clouds. Will this change with climate change or stay the same and if changes do happen what would the effects be do to increased or decreased cloud coverage?