Humans breathe in air that is comprised primarily of nitrogen and oxygen, with small amounts of carbon dioxide; trace amounts of thousands of pollutants are also present.
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Q21: Commercial logging by European countries in the
Q23: _ is a biomass fuel.
A) Coal
B) Oil
C)
Q25: Despite an international agreement signed in 1987
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Q33: Heat is considered a type of water
Q34: Most of the energy used by humans
Q35: Creation of sustainable ecosystems cannot be achieved
Q36: Destruction of the ozone due to pollutants
Q38: Although it was one time hoped that
Q40: A renewable energy source that taps into
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