RRB NTPC · Bite-size lessons

Environmental Issues Concerning India and the World

About 7 min · General Awareness · English

Time worked out from the lesson's 464 words at 150 words a minute, plus a minute for each question.

This topic tests awareness of India's environmental challenges (air/water pollution, deforestation, wildlife conservation) and global issues like climate change, international treaties, and sustainability efforts. Questions may ask about causes, effects, government schemes, or key international agreements.

Key ideas

• Climate Change: Long-term shift in global temperature and weather patterns caused primarily by greenhouse gas emissions (CO₂, CH₄, N₂O) from burning fossil fuels, deforestation, and industrial activity. Effects include rising sea levels, extreme weather events, glacier melting, and disrupted agriculture.
• Greenhouse Effect: Natural process where gases like CO₂, methane, and water vapour trap heat in Earth's atmosphere. Human activities have intensified this effect, leading to global warming.
• Air Pollution: Contamination of air by particulate matter (PM2.5, PM10), nitrogen oxides (NOₓ), sulphur dioxide (SO₂), carbon monoxide, and ozone. Major sources: vehicular emissions, industrial discharge, crop burning. Health impacts include respiratory diseases and cardiovascular problems.
• Water Pollution: Contamination of rivers, lakes, groundwater by industrial effluents, sewage, agricultural runoff (pesticides, fertilisers), and plastic waste. Leads to eutrophication, loss of aquatic life, and waterborne diseases.
• Biodiversity: Variety of life forms (species, genes, ecosystems) on Earth. India is a megadiverse country with four biodiversity hotspots. Loss of biodiversity threatens ecosystem services, food security, and medical resources.

Watch out for

• Confusing treaties by purpose: Students mix up Paris Agreement (climate/emissions) with Montreal Protocol (ozone layer). Fix: Paris = carbon emissions/warming; Montreal = ozone hole/CFCs.
• Assuming all pollution is the same: Air, water, soil, noise, plastic pollution have different causes, effects, and solutions. Fix: Study each type separately—air (PM, NOₓ from vehicles/industry), water (sewage, chemicals in rivers), plastic (non-biodegradable waste).
• Wrong Schedule classification under Wildlife Act: Placing wrong species in wrong schedule. Fix: Schedule I = highest protection (tiger, elephant, rhinoceros, snow leopard); Schedule II = less protected but still important;

Quick reference

• Paris Agreement (2015): Limit global warming to 1.5–2°C; India's updated NDC (2022): about 50% non-fossil power capacity, 45% emissions intensity cut by 2030 (from 2005 levels).
• Montreal Protocol (1987): Phase out CFCs/ozone-depleting substances; Kigali Amendment (2016) targets HFCs.
• India's biodiversity hotspots: Himalayas, Western Ghats, Indo-Burma (Northeast), Sundaland (Nicobar).
• PM2.5 (particles ≤2.5 microns): Most harmful air pollutant; penetrates lungs/blood; major contributor to respiratory disease.
• Wildlife Protection Act (1972): Schedule I = strictest protection (tiger, elephant, snow leopard); CITES regulates international trade.

Check yourself: 3 questions

This lesson is cut from the topic's note, not rewritten. Fact-checked on 18 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.

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