Question

The carbon dioxide content in Earth's atmosphere is

• A. $93\%$
• B. $0.5\%$
• C. $0.03\%$
• D. $0.001\%$

Answer 1

The correct option is C $0.03\%$

Carbon dioxide is an important trace gas in Earth’s atmosphere, currently constituting about $0.03\%$ of the atmosphere. Despite its relatively small concentration, it is a potent greenhouse gas and plays a vital role in regulating Earth’s surface temperature.