Lesson 6.3: Environmental Issues – Pollution, Global Warming, Deforestation
Understanding environmental issues is essential for UPSC General Studies, as they impact health, economy, and climate stability.
Pollution:
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Air Pollution: Causes – vehicular emissions, industries; Effects – respiratory diseases, acid rain.
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Water Pollution: Causes – industrial effluents, sewage; Effects – aquatic life degradation, health hazards.
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Soil Pollution: Causes – pesticides, mining; Effects – soil fertility loss, food contamination.
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Noise & Light Pollution: Urbanization effects on human and wildlife health.
Global Warming & Climate Change:
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Definition: Rise in Earth’s average temperature due to greenhouse gas emissions.
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Causes: CO₂, methane, deforestation, fossil fuel combustion.
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Impacts: Melting glaciers, rising sea levels, extreme weather events, biodiversity loss.
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Mitigation Measures: Renewable energy adoption, afforestation, emission reduction policies.
Deforestation:
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Definition: Large-scale removal of forests for agriculture, urbanization, or industry.
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Effects: Habitat loss, soil erosion, climate imbalance, reduced carbon sequestration.
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Conservation Strategies: Afforestation, community forestry, strict legal measures.
Key Points for Revision:
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Types and causes of pollution
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Global warming causes, impacts, and mitigation
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Deforestation effects and conservation methods
Example Question (Prelims Practice):
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“Which gas is primarily responsible for global warming?” → Carbon dioxide (CO₂)
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“Which program in India aims at reducing air pollution?” → National Clean Air Program (NCAP)
