How does greenhouses keep earth warm?

Greenhouses keep the Earth warm through the greenhouse effect, where sunlight enters the atmosphere and warms the Earth's surface. This heat is then radiated back into space as infrared radiation. However, greenhouse gases like carbon dioxide and methane trap some of this heat, preventing it from escaping, thus warming the atmosphere. This natural process is essential for maintaining a climate that supports life, but an excess of these gases can lead to global warming.