Multiple Choice
As of 2015, what is the approximate CO2 level in Earth's atmosphere?
A) 100 ppm
B) 200 ppm
C) 400 ppm
D) 800 ppm
E) 1200 ppm
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q18: Greenhouse gases include all of the following
Q19: Researchers estimate that black carbon may account
Q20: Based on a stringent mitigation scenario for
Q21: What was the relationship between Earth's temperature
Q22: Which of the following is the best
Q24: Different surfaces reflect more or less sunlight,
Q25: In a single year, which of the
Q26: Which best represents the thickness of Earth's
Q27: According to analysis of air in Greenland
Q28: Past and future human actions influence the