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Global Warming.
Evidence for global warming
Temperature records.

Since the 1850's temperature has been measured around the world using thermometers. This is very
reliable, but only a short term record of global temperature change.


Using tree rings to work out how old a tree is. Most trees produce one…

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Rising temperature. This will affect the metabolism of all organisms, as enzymes denature
once past 40 decrees Celsius. It will also affect the distribution, as conditions in their habitat
may change, and they may not be able to survive the change, so will have to move out of


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