Which is true of the amount of CO2 in our atmosphere?
A)CO2 is the most abundant gas in the atmosphere.
B)The level of CO2 has been decreasing at the rate of 3.1% per year since 2000.
C)The level of CO2 in May 2016 was 408 ppm.
D)The level of CO2 has been much higher during the past 800,000 years than it is now.
E)The level of CO2 is at the lowest levels now it has been in the last 50 years.

Question

Quizplus · Accepted Answer

The level of CO2 in May 2016 was 408 ppm, according to data from the Mauna Loa Observatory. None of the other choices are true. CO2 is not the most abundant gas in the atmosphere (nitrogen is), the level of CO2 has been increasing, not decreasing since 2000, the level of CO2 has been much higher in the past, and the level of CO2 is not at the lowest levels in the last 50 years.

Which Is True of the Amount of CO2 in Our