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NASA Scientist Jim Hansen Has Recommended That We Bring Our

Question 46

Multiple Choice

NASA scientist Jim Hansen has recommended that we bring our atmospheric carbon dioxide levels down to _____ from the current level of _____ in order to maintain a planet with fairly constant atmospheric temperatures.


A) 450 ppm, 500 ppm
B) 350 ppm, 390 ppm
C) 388 ppm, 450 ppm
D) 488 ppm, 550 ppm
E) 560 ppm, 660 ppm

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