Question

what purpose do greenhouse gases serve in the atmosphere?

Explanation:

Greenhouse gases trap heat (infrared radiation) in the atmosphere. This process, known as the greenhouse effect, helps maintain the Earth's temperature at a level suitable for life. Without greenhouse gases, the Earth would be much colder. However, an excessive increase in greenhouse gases (like due to human activities such as burning fossil fuels) can lead to enhanced greenhouse effect and global warming.

Answer:

Greenhouse gases trap heat (infrared radiation) in the atmosphere, maintaining Earth's temperature (through the greenhouse effect). Excessive amounts can cause global warming.