lundi 26 mai 2014

Greenhouse gases

Greenhouse gases

 What are greenhouse gases ?

Many chemical compund found in the Earth's atmosphere act as "Greenhouse gases". Greenhouse gases absorb this infrared radiation and trap the heat in the atmosphere. 
Earth is threatened by the greenhouse gases.

  Figure 1 is a line graph showing the trends in atmospheric concentrations and anthropogenic emissions of carbon dioxide. 

 Figure 1. Trends in Atmospheric Concentrations and Anthropogenic Emissions of Carbon Dioxide

 The natural greenhouse effect .

The atmosphere has a number of gases, often in tiny amounts, which trap the heat given out by the Earth.
The factories used to use poisonous gas.
 Some of the activities of man used to produce greenhouse gases.
 The people used to use burning fossil fuels, coal, oil and natural gas, releases carbon dioxide into the atmosphere.
 The Earth is wrapped in a blanket by air called the 'atmosphere', which is made up of several layers of gases.
The Greenhouse gases are very important and are mainly:



  • water vapour
    occurs naturally in the atmosphere.
  • carbon dioxide
    is
    produced naturally by people and animals breathe. Plants and trees absorb carbon dioxide to live. Volcanoes also produce this gas. Carbon dioxide is not the same as carbon monoxide
  • methane
    comes from cattle as they digest their food. The gas also comes from fields where rice is grown in paddy fields.
  • nitrous oxide
    when plants die and rot, nitrous oxide is produced.
  • ozone
    occurs naturally in the atmosphere. 

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