Already practically doesn’t raise the doubts that the genie of global warming , threatening by terrible troubles, has been released from a bottle by the mankind. The mankind “heats up” the Earth: that mega cities, in which tons of fuel daily burn down, in huge furnaces. However, it is surprising, the civilization creates their full contrast also - a cool oases which reduce effect of temperature rise on the planet. It is a issue of the irrigated grounds.
Scientists from the American National laboratory “Lorenz Livermore†have paid attention to a climate in the Central Valley in California which farmland are irrigated by the branched network of irrigational channels. Having generalized data for last hundred years, scientists have found out, that here is always colder than in all neighboring areas approximately on 1,5 degrees,. The further analysis has shown, that within 20th century winter, in researched district ,became warmer, in full accordance with the tendency of global warming, and in summer months did not become warmer. The conclusion is obvious: on a climate take effect irrigation canals which fill with water in a warm season of a year.
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Researchers prove that irrigational system is capable to resist to effect of global warming - and not only in limits of district in which it is located. The matter is that the part of a solar energy run off on evaporation of water from the irrigated ground instead of heating up the atmosphere. Cool air is not retaining above channels with water, but extends around as the huge conditioner works - the mechanism of this phenomenon is not solved yet completely . Anyhow, the mid-annual temperature in the Central valley is on 3 degrees lower, than could be, speak scientists.
Today the irrigated grounds get 40 % of a crop of all world. However their area in the different countries of the world recently has ceased to increase. And here and there, for example, in the United States, from 1998 to 2003 the irrigated grounds was reduced to 2 % because of move forward of city suburbs to farmland. Agriculturists warn: if that will proceed further, there will be nothing to feed an increasing population of the Earth. Similar, together with agriculturists should rise and ecologists on protection irrigation: mankind cannot permit in no way to lose such powerful weapon of struggle against global warming.
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