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Nowadays  we are living in the time of rapid scientific and technological progress, which results in an increasing effect on the  biosphere  of earth.       i consider that the most destructive problem of nature is global warning. this  phenomenon causes the increase in the average temperature of the earth’s near-surface air and oceans in recent decades.       today the issue of global warming has become a question of  vital concern. the global average air temperature near the earth’s surface raised 0.742c during the 100 years ending in 2005. moreover, the global warming is a terrific climate change, which will cause the global cooling in future. increasing global temperature will increase the intensity of extreme weather events and change the amount of precipitation.       however, not all of the reasons that cause global warming are of human nature. natural phenomena such as solar variation combined with  volcanoes  probably had a small warming effect.       the earth’s climate changes in response to variations in its orbit around the sun, volcanic  eruptions, and atmospheric greenhouse gas concentrations. people are responsible for the latter and have to take serious measures as increasing global temperature will cause the level of world ocean to rise. other effects of global warming include the changes in agricultural yields, species  extinctions of flora and fauna and increases in the range of disease vectors.       global warming could also affect human health, harm wildlife and damage ecosystems. warming may enhance air pollution, particularly in  urban  centres, increasing the incidence of respiratory diseases. asthma and allergic disorders result from climate changes too. health risks can be solved through various scientific  strategies  which may include improved and extended medical care services, better housing and air conditioning, water  purification  and public education.       most national governments have signed the kyoto protocol aimed at reducing greenhouse gas emissions. however, i don’t think that is enough to lessen the negative influence of global warming. the next way out would be to stop using fuel and start exploiting alternative natural resources like water, solar and wind power that may provide us with the necessary amount of energy.       we all have to remember that this planet is our home. it gives us so many resources to live on so we have to take care of it as well.