AP Environmental Science MCQ AP Environmental Science Chapter 19 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.

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.

Naim 15:32 AP Environmental Science Chapter 19

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

Answer: A

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