One of major climate change happens now is global warming, which has been observed sine mid-20th century. Scientists have agreed to attribute this phenomenon on "greenhouse effect" - warming of the globe as the result of trapped radiated heat from Earth towards space by the atmosphere.
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photo from climatekids.nasa.gov |
The green house effect happens when heat radiated from sun towards Earth is not reflected back to space as it suppose to be. Certain gases in the atmosphere block and prevent the heat from escaping the Earth. These gases are long-lived and semi-permanently remained in our atmosphere. In addition, this gases do not react physically or chemically to changes in temperature, hence, these gases are dubbed as "forcing" climate changes by scientist.
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| gases that contribute to greenhouse effect |
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