What Causes Global Warming?
Scientists think that Global Warming is caused
by the gases produced when humans burn coal, oil, etc. These gases trap
the sun's heat in the atmosphere. Carbon dioxide is made when these fuels
are burned. Percentage of carbon dioxide in the atmosphere has been rising
as result of human industries since the Industrial Revolution.
Heat absorbing gases are known as greenhouse gases. The warming of the atmosphere
is called the greenhouse effect. Humans add extra greenhouse gases, which
gains a bigger chance in the greenhouse effect. The increase causes global
warming.
CARBON DIOXIDE
There are many ways that carbon dioxide is added into the atmosphere. When
cutting down deforestation of the world's rain forests, it adds carbon dioxide
to the atmosphere. Wood decay, burning wood, cement-making, and fossil-fuels
also adds more carbon dioxide. This is all because of the Industrial Revolution.
Carbon dioxide levels still take up less than 1% in the atmosphere, but scientists
think the percentage may rise. The carbon dioxide levels in the atmosphere
are about 30% higher than in 1860. Carbon dioxide levels may reach to 600
parts per million by the year 2050 and the Earth's temperature may rise from
2 to 6 Fahrenheit by 2100, says the scientists of Intergovernmental Panel
on Climate Change (IPCC).
ANOTHER CAUSE
Global warming is also caused by solar radiation in the form of
light waves,that pass trough the earth's atmosphere. Most of this radiation
is observed by the earth and warms it. But some of the solar energy is radiated
out of the earth and into space and its turned into the form of infrared
waves. Also some of this out going infrared radiation is trapped by the earths
atmosphere and warms the earth again and again, and the atmosphere is being
thickened by all of the earth's pollution that the whole world is causing.