What is the greenhouse effect and how does it cause climate change?
संक्षिप्त उत्तर
The greenhouse effect is the natural process by which gases in the atmosphere, such as carbon dioxide, methane and water vapour, trap some of the heat radiated by the Earth, keeping the planet warm enough for life. Human activities, mainly burning fossil fuels and deforestation, add more of these gases, which traps more heat and causes global warming.
स्टेप-बाय-स्टेप
- Short-wave radiation from the Sun passes through the atmosphere and warms the Earth's surface.
- The Earth gives off long-wave (infrared) radiation.
- Greenhouse gases absorb some of this radiation and re-emit it, warming the lower atmosphere.
- More greenhouse gases mean more heat is trapped: the enhanced greenhouse effect.
- Consequences include rising sea levels, more extreme weather and changing rainfall patterns.
हल किया गया उदाहरण
Main human sources of greenhouse gases
- Carbon dioxide: burning coal, oil and gas; deforestation
- Methane: livestock, rice paddies, landfill
- Nitrous oxide: fertilisers
आम गलतियाँ
- Saying the greenhouse effect is bad in itself. Without it, the Earth would be about 33 °C colder.
- Confusing climate change with the hole in the ozone layer.
- Listing effects without linking them to causes.
परीक्षा से पहले कमियाँ दूर करने का सबसे तेज़ तरीका है ट्यूटर के साथ वन-टू-वन क्लास। पहली क्लास मुफ़्त है।
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