WHAT IS GLOBAL WARMING ? • increasing concentration of greenhouse gases like carbon dioxide in the atmosphere • Carbon dioxide traps the sun rays • This rises the earth’s temperature • Ice at the polar regions melt • Water levels in the water bodies increases • Causing floods
What causes global warming • increase in carbon dioxide • cutting down trees • Increase in use of fossil fuel and domestic fuel • The smoke left by the industries etc
EFFECTS OF GLOBAL WARMING • EFFECTS ON WEATHER AND CLIMATE • RISE IN SEA LEVEL. • EFFECTS ON RANGE OF SPECIES DISTRIBUTION. • crop PRODUCTION.
EFFECTS ON WEATHER AND CLIMATE. • Warming of the troposphere & cooling of the stratosphere . • This would cause wide-spread change in precipitation patterns due to changed in pattern of the air mass movements. • The precipitation will increase at higher latitudes but will decrease at lower latitudes. • The frequency of extreme drought and floods will increase. • Increase in human disease
RISE IN SEA LEVEL • Rise of temperature could lead to the melting of ice sheets that hold back glaciers. This results in rising sea levels. • A rise of even half a meter in sea level would affect human population, one third of which lives within 6okm of a coast. • Thus, rise in sea level will have negative impact on human settlements, tourism, water supply, fisheries, agriculture and coastal ecosystems.
EFFECTS ON RANGE OF SPECIES DISTRIBUTION. • Each plant and animal species occurs within a specific range of temperature • Shift in temperature range affects altitudinal and latitudinal distribution pattern of organisms. • Many species may shift slowly poleward or towards high elevations of mountain areas. • Rapid increase in temperature may cause large scale death of many trees, as they are sensitive to temperature stress • . • Many species may disappear, as they are unable to migrate fast enough to track temperature change.
CROP PRODUCTION. • Global warming will reduce crop production due to increased incidence of plant diseases • explosive growth of weeds and enhanced basal rate of respiration of plants. • In temperate regions, small rise in temperature may enhance the crop productivity slightly • larger temperature change will decrease the crop productivity there. • in tropical and subtropical regions, small rise in temperature. will have detrimental effect on crop productivity.
HOW TO PREVENT GLOBAL WARMING • Plant trees.
Conservation of earth • Reduction in green house gas emission by reducing the use of fossil fuels an • developing alternative renewable sources of energy like solar energy, wind energy etc. • Increase of the vegetation cover, particularly forest for photosynthesis utilization of CO2.