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Greenhouse effect - Wikipedia
The greenhouse effect occurs when heat-trapping gases in a planet's atmosphere prevent the planet from losing heat to space, raising its surface temperature. Surface heating can happen from an internal heat source (as in the case of Jupiter) or come from an external source, such as a host star.

Greenhouse effect | Definition, Diagram, Causes, & Facts | Britannica
Greenhouse effect, a warming of Earth’s surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapor, carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapor has the largest effect.

What is the greenhouse effect? - Science@NASA
The greenhouse effect is the process through which heat is trapped near Earth's surface by substances known as 'greenhouse gases.' Imagine these gases as a cozy blanket enveloping our planet, helping to maintain a warmer temperature than it would have otherwise.

What is the Greenhouse Effect? Definition, Causes, and Effects
The Greenhouse Effect is a natural process that occurs in Earth's atmosphere, where certain greenhouse gases trap heat from the sun and keep the planet's temperature within a range suitable for life. The greenhouse effect is important for maintaining the balance of the Earth's climate.

What Is the Greenhouse Effect? - Science@NASA
The greenhouse effect is a process that occurs when certain gases in Earth's atmosphere trap the heat from the sun near the surface. This process keeps Earth’s surface warmer than it would be without it.

The Greenhouse Effect and our Planet - Education
The greenhouse effect happens when certain gases, which are known as greenhouse gases, accumulate in Earth’s atmosphere. Greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ozone (O3), and fluorinated gases.

Greenhouse effect - Understanding Global Change
Life as we know it would be impossible if not for the greenhouse effect, the process through which heat is absorbed and re-radiated in that atmosphere. The intensity of a planet’s greenhouse effect is determined by the relative abundance of greenhouse gases in its atmosphere.

Greenhouse Effect - National Geographic Society
Greenhouse gases let the sun’s light shine onto Earth’s surface, but they trap the heat that reflects back up into the atmosphere. In this way, they act like the insulating glass walls of a greenhouse. The greenhouse effect keeps Earth’s climate comfortable.