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ARC-Easy / Mercury_SC_401611 / Many scientists are convinced that an increase of certain gases in the…

Problem

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question

Many scientists are convinced that an increase of certain gases in the atmosphere is affecting global temperatures. What makes this hypothesis difficult to prove?

choices

  • Trees absorb these gases.
  • Global temperatures are rising.
  • Many variables affect global temperatures.
  • Many human activities produce these gases.

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