what percentage of the atmosphere is carbon dioxide

Carbon dioxide occupies about 0.04% of the Earths atmosphere. This is a relatively small percentage, but it has a significant impact on global warming because of its ability to absorb heat emitted from the Earth's surface. The concentration of carbon dioxide in the atmosphere is currently at nearly 412 parts per million (ppm) and rising, which represents a 47 percent increase since the beginning of the Industrial Age.