Global Warming - Page 2 of 4 - Chiragg Express
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Global Warming

causes and effect of global warming …..


Almost 100% of the observed temperature increase over the last 50 years has been due to the increase in the atmosphere of greenhouse gas concentrations like water vapour, carbon dioxide (CO2), methane and ozone. Greenhouse gases are those gases that contribute to the greenhouse effect (see below). The largest contributing source of greenhouse gas is the burning of fossil fuels leading to the emission of carbon dioxide.

Greenhouse gases in the atmosphere (see above) act like a mirror and reflect back to the Earth a part of the heat radiation, which would otherwise be lost to space. The higher the concentration of green house gases like carbon dioxide in the atmosphere, the more heat energy is being reflected back to the Earth. The emission of carbon dioxide into the environment mainly from burning of fossil fuels (oil, gas, petrol, kerosene, etc.) has been increased dramatically over the past 50 years,

Cause for global warming: Carbon dioxide emission
fig 1.3: graph showing percentage of carbon emission


There are two major effects of global warming:

  • Increase of temperature on the earth by about 3° to 5° C (5.4° to 9° Fahrenheit) by the year 2100.
  • Rise of sea levels by at least 25 meters (82 feet) by the year 2100.
Global warming causes: CO2 concentration
fig 1.4: the concentration of carbon dioxide increased in 50 years
Trends in greenhouse gas emissions
fig 1.5: major global trends ..

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