Author Question: Global warming is caused by increased concentrations of ____________________ in the atmosphere Fill ... (Read 21 times)

nmorano1

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Global warming is caused by increased concentrations of ___________________ _ in the atmosphere Fill in the blank(s) with the appropriate word(s).

Question 2

Earths human population reached ___________________ _ in 2011 and is prjected to be
  ___________________ _ in 2045. Fill in the blank(s) with the appropriate word(s).




TheDev123

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Answer to Question 1

greenhouse gases

Answer to Question 2

7 billion, 9 billion



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