Final answer:
The greenhouse effect happens in the troposphere layer of the atmosphere. Greenhouse gases trap infrared radiation and make the lower layers of the atmosphere warmer.
Step-by-step explanation:
The greenhouse effect happens in the troposphere layer of the atmosphere. The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface to an altitude of about 11-13 km (7-8 miles).
In this layer, greenhouse gases like carbon dioxide and methane trap some of the infrared radiation that escapes from the Earth's surface, resulting in the lower layers of the atmosphere being warmer. The upper layers, such as the stratosphere, mesosphere, and thermosphere, are colder in comparison.