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Scientific Studies and Models Indicate We Need to Prevent CO₂

Question 5

Multiple Choice

Scientific studies and models indicate we need to prevent CO₂ levels from reaching an irreversible tipping point of ____ ppm, which could set into motion large-scale, long-term changes.


A) 450 ppm
B) 500 ppm
C) 550 ppm
D) 600 ppm
E) 650 ppm

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