(5) Relationship between rises in concentration of gases

The relationship between the rises in concentrations of atmospheric carbon dioxide, methane and oxides of nitrogen and the enhanced greenhouse effect. 

Greenhouse effect - natural process that creates moderate temperatures on earth to which life has adapted. Some gases absorb some of the infra red radiation that would ususally leave the Earth. This means the Earth is about 30 degrees warmer than it would be without any greenhouse gases and would be too cold to sustain life.

Enhanced greenhouse effect - concertn that the activities of humans may be increasing the levels of CO2 and other greenhouse gases' such as methane and the oxides of nitrogen in the atmosphere. This may lead to increased global temperature and climate change. 

Greenhouse gases are important - they are needed to sustain life. However the gases that are enhanced are a cause for concern.

The name The Greenhouse Effect is based on the idea that it's like a greenhouse; the temperature is higher on the inside, and the heat is trapped inside. 

Most of the atmosphere is made of notrogen and oxygen. Neither absorb much infra red radiation. 

CO2, methane and oxides of nitrogen do absorb. Methane contributes the most. 


Precautionary principle as justification for strong action in response to the threat posed by the


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