Preindustrial levels of atmospheric carbon dioxide have been estimated to be approximately 275 ppm (parts per million). If unchecked, carbon dioxide levels are expected to reach by the year 2100.
Ppm
A) 825
B) 775
C) 550
D) 2750
E) 1100

Question

Quizplus · Accepted Answer

Current scientific projections estimate that if carbon dioxide emissions continue to rise unchecked, atmospheric levels could reach approximately 1100 ppm by the year 2100. This is based on high-emission scenarios without significant mitigation efforts.

Preindustrial Levels of Atmospheric Carbon Dioxide Have Been Estimated to Be