Greenhouse effect. Mechanism, model and gases

09/04/2026

The online greenhouse effect simulations on this page serve as a model of how the greenhouse effect works and show the mechanism of the greenhouse effect. They also show some of the main greenhouse gases.

What is the greenhouse effect

The greenhouse effect is a natural process in which certain gases in the Earth’s atmosphere retain part of the infrared radiation emitted by the Earth after receiving solar energy. This causes the atmosphere to warm, allowing the surface temperature to become suitable for life.

The scientific basis for the greenhouse effect has been supported by multiple lines of evidence, including direct measurements of gas concentrations in the atmosphere, studies of infrared radiation, and models of the greenhouse effect that simulate the behavior of the Earth in response to changes in greenhouse gas levels.

How the greenhouse effect works. Mechanism of the greenhouse effect

Basic mechanism of the greenhouse effect is as follows. Solar radiation reaching the Earth consists mainly of short-wave radiation, such as visible light and ultraviolet (UV) rays. Some of this radiation is reflected back into space by the Earth’s surface and clouds, while some is absorbed by the atmosphere, the oceans and the Earth’s surface.

The Earth’s surface, once heated by solar radiation, emits long-wave radiation, also known as infrared (IR) radiation. Some gases present in the atmosphere have the capacity to absorb and re-emit part of this infrared radiation.

Main greenhouse gases

The main greenhouse gases are water vapor (H₂O), carbon dioxide (CO₂), methane (CH₄) or nitrous oxide (N₂O) have the ability to absorb and re-emit part of this infrared radiation. These gases are known as greenhouse gases because of their ability to trap and retain heat in the atmosphere. When infrared radiation is absorbed by greenhouse gases, the molecules become energized and subsequently emit radiation back in all directions, including towards the earth’s surface. This results in a net increase in thermal energy on Earth, leading to an increase in atmospheric and surface temperature.

Explore the exciting STEM world with our free, online, simulations and accompanying companion courses! With them you’ll be able to experience and learn hands-on. Take this opportunity to immerse yourself in virtual experiences while advancing your education – awaken your scientific curiosity and discover all that the STEM world has to offer!

Greenhouse effect simulations

Greenhouse effect model

This simulation is a simple but very instructive model of the mechanism of the greenhouse effect. How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today. What happens when clouds are added? Change the concentration of greenhouse gases and see how the temperature changes. Then compare the effect of crystals. Zoom in and see how light interacts with molecules Do all gases in the atmosphere contribute to the greenhouse effect?

Radiation balance on Earth

This animation summarizes the various factors involved in the Earth’s radiation balance. Therefore, it is also a model of the greenhouse effect, albeit a very simplified one.

Water vapor

Water vapor is an important greenhouse gas. The water molecule is composed of two hydrogen atoms and one oxygen atom bonded together by a covalent bond. That is, the two hydrogen atoms and the oxygen atom are bonded together by sharing electrons. Its formula is H2O.

Water

H₂O

Single bond

Double bond

Triple bond

Wedge bond

Hash bond

Carbon dioxide

Carbon dioxide, whose chemical formula is CO2, is a compound of carbon and oxygen that exists as a colorless gas at standard temperature and pressure conditions. Prior to the 2005 IUPAC standards, it was also known as carbonic anhydride.

Carbon dioxide

CO₂

Single bond

Double bond

Triple bond

Wedge bond

Hash bond

Methane

Methane is the simplest alkane hydrocarbon, whose chemical formula is CH4. Each of the hydrogen atoms is bonded to carbon by a covalent bond. It is a non-polar substance that occurs as a gas at ordinary temperatures and pressures. It is colorless, odorless and insoluble in water.

Methane

CH₄

Single bond

Double bond

Triple bond

Wedge bond

Hash bond

Nitrous oxide

Nitrous oxide, whose chemical formula is N2O, also known as laughing gas, is a colorless gas with a sweet, slightly toxic odor and anesthetic effect. It is one of the most important greenhouse gases and is a contributor to stratospheric ozone depletion.

Nitrous oxide

N₂O

Single bond

Double bond

Triple bond

Wedge bond

Hash bond

Giants of science

“If I have seen further, it is by standing on the shoulders of giants”

Isaac Newton

Alexander von Humboldt

1769

–

1859

Alexander von Humboldt integrated geology, climate, and biology observations to found modern geography, showing the connections between nature, climate, and life

“Nature is a living whole of interconnected forces”

Evangelista Torricelli

1608

–

1647

Evangelista Torricelli invented the mercury barometer, demonstrating the existence of atmospheric pressure, and made advances in hydrodynamics, geometry, and applied optics

“We have only today; let us make good use of this day”

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1772

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1864

Luke Howard developed the first systematic cloud classification, establishing a universal terminology still used in modern meteorology

“By naming the clouds, we speak a common language of the atmosphere”

Alexander von Humboldt

1769

–

1859

Alexander von Humboldt integrated geology, climate, and biology observations to found modern geography, showing the connections between nature, climate, and life

“Nature is a living whole of interconnected forces”

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Test your knowledge

What is the greenhouse effect?

The greenhouse effect is a natural physical process that occurs in the Earth’s atmosphere in which certain gases, known as greenhouse gases, trap part of the heat that the Earth’s surface emits after being warmed by solar radiation. Without this effect, the energy would escape freely into space and the planet would be much colder, while thanks to it the average temperature remains at levels suitable for life. This phenomenon allows ecosystems and natural cycles to develop in a stable way and provides basic conditions for the existence of plants, animals, and humans.

How does the greenhouse effect work in the atmosphere?

The greenhouse effect works because solar radiation passes through the atmosphere as visible light and warms the Earth’s surface, which in turn emits heat in the form of infrared radiation. Part of this radiation escapes into space, but another part is absorbed by greenhouse gases, which then reemit this energy in all directions, including back toward the surface and the lower atmosphere. In this way, the planet’s average temperature rises, acting like a thermal blanket that keeps the Earth warm enough to support life and regulates natural climate cycles.

Why is the greenhouse effect important for life on Earth?

The greenhouse effect is crucial because it allows the Earth to retain enough heat to maintain suitable surface temperatures, making liquid water and the ecosystems that depend on it possible. Without this effect, the solar energy received would be lost rapidly to space and the planet would be extremely cold, while thanks to the heat retained by greenhouse gases, a thermal balance is achieved that regulates natural cycles and provides stable conditions that allow plants, animals, and humans to thrive in a habitable environment.

Which gases maintain the natural greenhouse effect?

The main gases that contribute to the natural greenhouse effect are carbon dioxide, water vapor, methane, and nitrous oxide, and although some occur naturally in the atmosphere, they all serve to trap part of the heat emitted by the Earth’s surface. These gases allow solar radiation to reach the surface freely and warm it, but they capture part of the heat that the Earth emits back into space, acting as a thermal regulation mechanism that keeps the planet’s temperature within a range suitable for life and allows ecosystems and natural water and energy cycles to remain stable.

What would happen if the greenhouse effect did not exist?

If the greenhouse effect did not exist, most of the heat the Earth receives would escape into space and the planet’s average temperature would be extremely low, making the presence of liquid water in large quantities impossible and preventing life as we know it from developing. The atmosphere would lose its ability to retain energy, oceans and continents would be much colder, and ecosystems could not survive, showing that this natural phenomenon is essential for creating a habitable environment and ensuring the stability of the biological and climatic cycles that sustain life on Earth.