____________ refers to the observed increase in the earth's average temperature.
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Q53: In the 1980s and 1990s, a _
Q54: President Reagan signed the 1987 _.
Q55: Transboundary externalities are _.
Q56: By the 1980s, evidence had accumulated that
Q57: _ is the most controversial contemporary global
Q59: By the time Clinton left office, the
Q60: At the 2009 _ President Obama became
Q61: President Obama's 2010 National Security Strategy was
Q62: In 2014 _ announced new standards that
Q63: The increase in U.S. shale-oil and shale-gas
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