At the University of California, Los Angeles, proposed a bizarre way to fight global warming. Idea is to ensure that create artificial volcanoes.
Why volcanoes? The fact that a particularly powerful eruptions have the most direct impact on the temperature of the entire planet. Eruptions in the upper atmosphere is pumped huge amount of aerosols (primarily sulfur compounds), which are covered with a blanket the entire globe and reflect back into space rather large amount of solar radiation, which leads to a decrease in temperature at the surface of the planet. Sometimes much as noticeable.
In 1816, for example, in Western Europe and North America had a "year without a summer": for example, the entire northeastern U.S. was covered with snow, and in June and July were very cold winter, and in Europe raging storms and floods. The following spring, grain prices soared tenfold, there was a massive famine, tens of thousands of Europeans have not yet managed to recover from the shock of Napoleonic wars, rushed for a better share in the United States. 1816 was the coldest for at least the preceding 550 years.
What caused this catastrophic phenomenon? Apparently, the two super-volcanoes. One documented happened in April 1815 — the volcano Tambora in Indonesia released into the atmosphere about 150 km3 ash and sulfur aerosols, which led the next year to a "volcanic winter."
There is a hypothesis that in 1809 happened in the tropics similar in strength of volcanic eruption (talk about it carried out in 2009, a study of the isotopic composition of Arctic sea ice). This eruption, apparently, also affected the global climate during the next decade.
More recently, the Pinatubo Volcano, who happened to erupt in 1991, also significantly affected global temperatures.
And the University of California, the possibility of creating an artificial "volcanic winter" in order to reduce the average annual temperatures. Computer simulations showed that the formation of a "cover" for a square meter of which will account for about 30 micrograms of sulfur aerosols, will reduce the temperature in the hottest time of the day at 7 ° C.
Hypothetical — a great way to fight global warming, if not one, or more precisely, the three "but": firstly, sulfur compounds erode the ozone layer, and secondly, sooner or later they are deposited, and it is not very great impact on the environment, and thirdly, the local climate effects can be far from the expected — droughts, hurricanes, and other consequences of human intervention in the natural functioning of Machina Mundi.