fifthlevel

Warming Global is an increase in the avarege tempereture of the Earth's near-surface air and oceans. It is provocate for The Greenhouse Effect. It is the process by which emission of infrared radiaction by atmospheric gases warms a planet´s surface. On Earth, the major natural greenhouse gases are

* Water Vapor, (H2O) which causes about 36-70% of the greenhouse effect (not including clouds) * Carbon Dioxide, (CO2) which causes 9-26% * Methane, (CH4) which causes 4-9% * Ozone, (O3) which causes 3-7%. The atmospheric concentrations of CO2 and CH4 have increased by 31% and 149% respectively above pre-industrial levels since 1750. About three-quarters of the anthropogenic (man-made) emissions of CO2 to the atmosphere during the past 20 years are due to fossil fuel burning. The rest of the anthropogenic emissions are predominantly due to land-use change, especially deforestation