Although we have little definite idea on how aerosols affect climate change, based on how aerosols affect temperature, it's likely that they reduces global warming and, ultimately, climate change. Aerosols affect temperature in two major ways. First, aerosols reflect small amounts of aerosols back into space. This helps to cool the atmosphere by reducing the amount of solar radiation that hits the surface. Aerosols also help to form clouds by changing the "frequency of cloud occurence, cloud thinkness, and rainfall amounts." A higher concentration of aerosols helps to expand the lifespan of a cloud and create smaller drops within the cloud; both of these effects help to reflect even more radiation back into space without reaching the surface.
Because cities often have more emissions into the air, this would, at first glance, make the temperature of cities drastically lower than that of the average landscape. Unfortunately, this is not true. The Heat Island Effect is primarily caused by the dark nature of the many man made surfaces in cities, and their tendancy to absorb more heat. While aerosols likely help to prevent an even more extreme temperature difference, they stilll do not spare the dark materials all solar radiation, so while they may recieve less radiation, they absorb more, and create the distinct and dangerous Heat Island Effect we know today.
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