35.What amount of carbon dioxide is present in earth’s atmosphere? [A] 12% [B] 1% [C] 0.04% [D] 3.8% Show Answer
The concentration of carbon dioxide in Earth's atmosphere is currently at nearly 412 parts per million (ppm) and rising. This represents a 47 percent increase since the beginning of the Industrial Age, when the concentration was near 280 ppm, and an 11 percent increase since 2000, when it was near 370 ppm.
