Radiation Absorption: The Sun emits short-wavelength radiation that passes through the atmosphere to the Earth's surface. The Earth then re-emits this energy as longer-wavelength infrared radiation.
Thermal Equilibrium: Under normal conditions, the amount of energy entering the system equals the amount leaving. Greenhouse gases disrupt this balance by absorbing the outgoing infrared energy and re-radiating it in all directions, including back toward the surface.
Concentration Correlation: There is a direct relationship between the concentration of and in the atmosphere and the global average temperature.
Fossil Fuel Combustion: The burning of coal, oil, and gas for energy releases large quantities of that were previously stored underground for millions of years.
Agricultural Practices: Methane () is significantly increased by livestock (cattle) during digestion and by the cultivation of rice in flooded paddy fields.
Waste and Land Use: The decay of organic waste in landfills and the destruction of natural carbon sinks (like peat bogs and forests) further contribute to the atmospheric gas imbalance.
| Feature | Natural Greenhouse Effect | Enhanced Greenhouse Effect |
|---|---|---|
| Cause | Natural atmospheric composition | Human activities (industry, farming) |
| Impact | Keeps Earth warm enough for life | Causes rapid, harmful global warming |
| Gas Levels | Stable over long periods | Rapidly increasing since Industrial Rev. |
| Outcome | Climate stability | Extreme weather and habitat loss |
Ozone Layer Confusion: A very common mistake is to claim that global warming is caused by a 'hole in the ozone layer.' These are two separate environmental issues; global warming is about heat trapping, not UV radiation.
Peat Bog Gases: Students often mistakenly think destroying peat bogs releases methane. While they are carbon stores, their destruction (especially through burning as fuel) primarily releases carbon dioxide.
Predictive Difficulty: While scientists can predict trends, it is difficult to state with 100% certainty exactly what the specific local consequences will be in every region.
