In recent years, the world has become darker than before.
This is the conclusion British environmentalists, having studied the state of the atmosphere. According to scientists, because of the high content of coal particles and other impurities sunlight can not get through to the earth's surface. This reduces the efficiency of solar cells and even slowing the growth of plants. According to the newspaper "The Guardian", the level of illumination of the Earth was reduced by 20 percent. This is directly related to global warming and the increasing amount of exhaust gases. Scientists have named this process of global darkening.