EPA 608 Core · Ozone Depletion · Medium
What baseline gas is used to establish Global Warming Potential (GWP)?
Answer: A. Carbon dioxide (CO2)
- ACarbon dioxide (CO2)✓ Correct
- BMethane (CH4)
- CNitrogen (N2)
- DTrichlorofluoromethane (CFC-11)
Why A is right
Carbon dioxide (CO2) is the baseline for GWP, having a value of exactly 1.
More Core questions
- Where is stratospheric ozone located?
- Why is stratospheric ozone vital for life on Earth?
- Which element in CFCs and HCFCs is responsible for ozone depletion?
- How does chlorine destroy ozone?
- What makes HFC refrigerants harmful to the environment?
Go deeper with the study guide EPA 608 Core Exam: Study Guide for 2026, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.