Presently, the annual average of CO₂ is about 400 ppm, and the concentration is increasing by about ____ ppm per year. A) 2 B) 5 C) 8 D) 12 E) 15

Name: Presently, the annual average of CO 2 is about 400 ppm, and the concentration is increasing by about ____ ppm per year. A) 2 B) 5 C) 8 D) 12 E) 15
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The concentration of CO2 in the atmosphere is increasing by about 2 ppm per year, which is a widely accepted estimate based on recent historical data.

​Presently, the Annual Average of CO2 Is About 400 Ppm

Presently, the Annual Average of CO₂ Is About 400 Ppm