Beginner Topic 1045 of 1102 Biochemistry, Environment & Industry

Greenhouse Effect

Gases trap infrared radiation, warming the planet.

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In-depth explanation of Greenhouse Effect

The greenhouse effect is the warming of a planet's surface because certain atmospheric gases absorb and re-emit infrared radiation. Sunlight passes largely through the atmosphere and warms the surface, which then emits infrared radiation that greenhouse gases such as CO2, water vapour and methane absorb. These gases re-radiate part of that energy back downward, warming the surface further. Without the natural greenhouse effect, Earth's mean surface temperature would be about minus 18 C instead of about 15 C. Enhanced concentrations from human emissions intensify this effect and cause global warming.

Going deeper: Greenhouse Effect

Key ideas: Sunlight passes through and warms Earth, which re-emits infrared; molecules with changing dipole moment in vibration (CO2, H2O, CH4, N2O) absorb IR and re-radiate part downward. Without it average temperature would be about minus 18 C instead of about plus 15 C. Radiative forcing is given in watts per square meter.

Common mistakes and connections: Mistake: confusing it with ozone depletion, or thinking it is entirely bad; the natural effect makes Earth habitable. N2 and O2 are not greenhouse gases because their vibration has no dipole change. Water vapor is the largest contributor but responds as a feedback. Links to IR spectroscopy and global warming.

Visualization of Greenhouse Effect

Earth emits mostly infrared near its 288 K average temperature. Greenhouse gases absorb in this range, unlike the visible sunlight that passes through. The interactive lesson shows this as a live animation or chart.

Worked example and use case

Venus has a dense CO2 atmosphere that produces an extreme greenhouse effect, with surface temperatures near 465 C.

Frequently asked questions about Greenhouse Effect

What is Greenhouse Effect?

Gases trap infrared radiation, warming the planet.

Is Greenhouse Effect a beginner, intermediate or advanced topic?

Greenhouse Effect is a beginner topic in Biochemistry, Environment & Industry. It needs no earlier chemistry lessons and is a good starting point.

What should I learn before Greenhouse Effect?

Study these earlier topics in Biochemistry, Environment & Industry first: Smart Materials, Biomaterials, Atmospheric Composition.

What comes after Greenhouse Effect?

The next topics in Biochemistry, Environment & Industry are Global Warming and Greenhouse Gases.

Can I practise Greenhouse Effect with quizzes?

Yes. The interactive lesson includes a self-check question on Greenhouse Effect, and the Biochemistry, Environment & Industry quiz draws on every topic in this area.

Where Greenhouse Effect fits in Biochemistry, Environment & Industry

Greenhouse Effect is topic 70 of 127 in Biochemistry, Environment & Industry.