The Greenhouse Effect: Natural vs Enhanced
Part of Greenhouse Effect — GCSE Chemistry
This deep dive covers The Greenhouse Effect: Natural vs Enhanced within Greenhouse Effect for GCSE Chemistry. Revise Greenhouse Effect in Atmosphere for GCSE Chemistry with 20 exam-style questions and 12 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 4 of 13 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 13
Practice
20 questions
Recall
12 flashcards
🔬 The Greenhouse Effect: Natural vs Enhanced
The Natural Greenhouse Effect
The natural greenhouse effect has operated throughout Earth's history and is essential for life. Here is the sequence:
- The Sun emits short-wave radiation (visible light and UV) — this passes through the atmosphere largely unimpeded
- Earth's surface absorbs this radiation and warms up
- The warm surface re-emits energy as long-wave infrared radiation
- Greenhouse gas molecules in the atmosphere absorb this infrared radiation
- They re-emit it in all directions — including back towards Earth's surface
- This keeps the surface warmer than it would otherwise be
The greenhouse effect is analogous to a glass greenhouse: the glass lets sunlight in but prevents heat from escaping, keeping the interior warm.
The Enhanced Greenhouse Effect
Human activities are increasing the concentrations of greenhouse gases in the atmosphere:
- More CO₂ from burning fossil fuels and deforestation
- More CH₄ from cattle farming, rice paddies, and landfill sites
- More N₂O from fertilisers and industrial processes
Higher concentrations of greenhouse gases mean more infrared radiation is absorbed and re-emitted back to Earth, causing additional warming above the natural level.