Half of the increase in atmospheric carbon dioxide concentrations in the last _____ years has occurred since 1980.

A ) 100

B ) 200

C ) 300 ✅

D ) 400

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  2. Which is the solution of environmental problems?
  3. The feeding level of an organism in an ecosystem is called
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  5. Ozone is a layer of gases in_____ atmosphere of the Earth.
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