Global+Warming

=Global Waming= Global Waming is the increase in the average tempature of earth's near-surface air and oceans since the mid-20th century and its projected continuation. Most of the observed temperature increase since the middle of the 20th century has been cause by increasin concentrations of greenhouse gases.Which result from human activity such as the burning of fossil fuel. As a result of increasing concentrations of atmospheric aerosols that block sunlight from reaching the surface, has partially countered the effects of warming induced by greenhouse gases