GLOBAL WARMING
Increase in the temperature of the earth’s atmosphere caused by the greenhouse effect. 0.75 °C (1.35 °F) relative to the period 1860?. Weather model projections summarized in the latest IPCC report indicate that global surface temperature will maybe rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.
The past 200-plus years, mean global temperatures have been rising from natural environment and human activity is a significant contributing factor in changing mean global temperatures. Mainly from vehicles, and burning forests, smokestacks, are perhaps the leading power driving the fashion.
Gases affect the green house, carbon dioxide, methane, nitrous oxide etc into the atmosphere. The major source of carbon dioxide is from power plants, twenty percent of carbon dioxide emitted by vehicles by burning gasoline. Methane is more than 20 times as effectual as CO2 at entrapping heat in the atmosphere.
Methane comes from rice paddies, bovine flatulence, bacteria in bogs, coal, tar sands, inside from the earth and fossil fuel manufacture. Direct effect by scattering and absorbing solar radiation, aerosols have indirect effects on the radiation. Deforestation is caused by cutting and burning of forests for the purpose of residence and industrialization. Natural phenomena such as solar variation and volcanoes produced most of the warming. Climate also changes in response to variations in Earth's orbit around the Sun, but as these orbital cycles vary over thousands of years. Increased radiative forcing from CO2.
Troposphere is the lowest layer of atmosphere extending about 6-10 km upwards from the earth’s surface Greenhouse gases and solar forcing affect the temperatures. Stratosphere is the layer of atmosphere above the troposphere, extending to about 50 km from the earth’s surface. Increase solar activity should warm the stratosphere while increase greenhouse gas they cool the stratosphere.
Some scientists say in 21st century temperature rise up to 3 to 8 degrees. Glacier retreat (mass of land ice formed by the accumulation of snow on high ground), ice shelf disorder such as that of the melt Ice Shelf, sea level rise, changes in rainfall patterns, changes in mountain snowpack, adverse health effects and increased intensity and frequency of extreme weather events are attributable in part to global warming.