Question

Which is true of the amount of CO2 in our atmosphere?

A) The level of CO2 is currently over 386 ppm.
B) The level of CO2 has been increasing at the rate of 3.1% per year since 2000.
C) The level of CO2 increased at the rate of 1.1% per year from 1990 to 1999.
D) The level of CO2 is higher than at any time in the past 800,000 years.
E) They are all true

Answer 1

The correct statement about the amount of CO2 in our atmosphere is that the level of CO2 is currently over 386 ppm. While other statements may have some support in the references provided, they are not completely accurate or comprehensive. Option E is correct.

Step-by-step explanation:

The correct statement about the amount of CO2 in our atmosphere is:

1. The level of CO2 is currently over 386 ppm.
2. The level of CO2 has been increasing at the rate of 3.1% per year since 2000.
3. The level of CO2 increased at the rate of 1.1% per year from 1990 to 1999.
4. The level of CO2 is higher than at any time in the past 800,000 years.

Hence, E) They are all true

Based on the provided references, the current level of CO2 in our atmosphere is higher than it has been in at least 800,000 years, at over 386 ppm. It is important to note that the current level of CO2 has been increasing over time and has exceeded levels seen in the past. The other statements, while they may be supported by some of the references, are not completely accurate or comprehensive.