Which of the following methods do scientists use to measure the amount of carbon dioxide in the atmosphere?

Locate an area outside that has clean, uncontaminated air and use a special type of flask to capture an air sample.

In the lab in a controlled setting, use a special type of flask to capture an air sample.

In the lab in a controlled setting, breathe directly into an open flask capturing a sample of carbon dioxide.

Use an airplane to travel high into the atmosphere. Then, use a special type of flask to reach out a window and collect an air sample.