Key takeaways
- The environment supplies resources, assimilates waste, sustains life and gives aesthetic services.
- Problems arise when demand exceeds carrying and absorptive capacity.
- India faces land degradation, pollution and biodiversity loss.
- Sustainable development meets present needs without harming future generations.
- Strategies: clean energy, LPG, CNG, composting and biopest control.
This is Chapter 9 of the Indian Economic Development chapter list for Class 11 Economics. It follows Chapter 8 and precedes the comparison with neighbours in Chapter 10.
9.1The Environment and Its Functions
The environment is the totality of resources and the living and non-living things around us. It performs four vital functions: it supplies renewable and non-renewable resources, it assimilates waste, it sustains life by providing genetic and biodiversity, and it provides aesthetic services such as scenery. It can do so without interruption only while demands stay within its carrying capacity.
Biotic elements are living: birds, animals, plants, forests and fisheries. Abiotic elements are non-living, such as air, water, land, rocks and sunlight. Renewable resources, like trees and fish, can be used without exhausting them provided extraction does not outrun regeneration. Non-renewable resources, like fossil fuels, are used up as they are extracted.
Carrying capacity means that resource extraction stays at or below the rate of regeneration and wastes stay within the environment’s absorptive capacity, its ability to absorb degradation. When these limits are crossed, the environment cannot sustain life, and a crisis follows.
9.2Why Environmental Problems Have Become Critical
Earlier, demand for environmental resources and services was well below supply, and pollution stayed within absorptive capacity. With population growth and industrialisation the relationship reversed: demand now exceeds the environment’s ability to supply resources and absorb waste. The costs include water scarcity, ill health, and spending on new technology and on global problems like warming and ozone depletion.
The result is high opportunity cost. Rivers and aquifers have been polluted and dried up, which makes water an economic good; exhausted resources force spending on exploration and technology; and falling air and water quality brings respiratory and waterborne disease (the book says about 70 per cent of India’s water was polluted). Two global issues add to the burden.
| Problem | Cause | Effect | Response |
|---|---|---|---|
| Global warming | Greenhouse gases such as carbon dioxide and methane from burning fossil fuels and deforestation | Rising temperature and sea level, coastal flooding, loss of species, more storms | Kyoto Protocol (1997) sought emission cuts by industrialised nations |
| Ozone depletion | Chlorine and bromine compounds such as CFCs and halons | More ultraviolet radiation: skin cancer, harm to plankton and plants | Montreal Protocol banned ozone-depleting chemicals |
The opportunity cost of environmental damage
Degraded environments carry real costs. Polluted rivers force cities to spend more on treating water, and where water is scarce households must buy it or travel far to fetch it. Air pollution adds to respiratory illness, so health spending and lost working days rise. When forests and soils are depleted, farm yields fall and new inputs must be bought to make up the loss.
These are examples of opportunity cost: money spent repairing damage cannot be spent on schools or roads. This is why economists argue that the cost of damage should be counted when judging whether a project or a policy is worthwhile.
9.3The State of India’s Environment
India is rich in soil, rivers, forests and minerals, but faces a double threat: degradation caused by poverty and pollution caused by affluence and industry. Priority issues are land degradation, loss of biodiversity, air pollution, management of fresh water and solid waste. Vehicles, thermal plants and industry drive pollution, and pollution control boards monitor it.
- Land degradation: caused by deforestation, over-extraction of fuelwood and fodder, shifting cultivation, overgrazing, poor irrigation management, excess agro-chemicals and open-access resources. Per capita forest land is only 0.08 hectare against 0.47 needed, and soil erodes at 5.3 billion tonnes a year.
- Pressure on resources: India supports about 16 per cent of the world’s people and 20 per cent of its livestock on 2.5 per cent of its land area.
- Air pollution: serious in cities because of vehicles, which are ground-level sources, and in industrial and thermal power areas.
- Industry: unplanned urbanisation, pollution and accident risk; the CPCB lists 17 categories of significantly polluting industries.
- Water: pollution of rivers and groundwater.
The Central Pollution Control Board (set up in 1974) and state boards study, set standards, inspect industries, monitor rivers and wells, and spread awareness. Community action also matters: the Chipko movement in the Himalayas and Appiko in Karnataka (1983, when villagers hugged trees in Salkani forest and saved about 12,000 trees) protected forests from commercial felling.
The role of institutions and individuals
Environmental protection needs both rules and everyday action. Pollution control boards set standards and inspect industries, and courts and tribunals can order polluters to stop or pay. But enforcement alone is not enough. Households can cut waste, save water and electricity, use public transport and segregate garbage. In the Chipko and Appiko movements, villagers protected forests by acting together.
The textbook activities, such as tracing a product back to the earth or comparing air-quality reports around Diwali, are meant to show that individual choices add up. A cleaner environment is a shared benefit, which is why it is hard to achieve without cooperation.
9.4Sustainable Development
Sustainable development is development that meets the needs of the present generation without compromising the ability of future generations to meet their own needs. Defined by the Brundtland Commission in Our Common Future, it stresses meeting the basic needs of the poor and leaving future generations no less quality of life, within the environment’s carrying capacity.
Meeting everyone’s needs means redistributing resources, so sustainability has a moral side. Edward Barbier ties it to raising the material living standards of the poor with lasting, secure livelihoods that minimise resource depletion. The present generation should conserve natural assets, preserve the regenerative capacity of natural systems and avoid shifting added costs or risks onto the future.
Herman Daly’s conditions
- Keep the human population within the carrying capacity, the economy’s equivalent of a ship’s Plimsoll line.
- Technological progress should be input-efficient, not input-consuming.
- Extract renewable resources no faster than they regenerate.
- Deplete non-renewables no faster than renewable substitutes are created.
- Correct inefficiencies caused by pollution.
Fairness across generations: an example
Consider a forest that can safely yield 100 tonnes of timber a year without shrinking. If this generation takes 100 tonnes a year, the forest remains for later generations. If it takes 150, the forest shrinks each year and future generations inherit less. The harvest is higher today, but at the cost of those who come after.
Sustainable development asks that the present generation leave the next a stock of natural and man-made assets no smaller than it received, so that the quality of life can be maintained.
9.5Strategies for Sustainable Development
Strategies include cleaner energy, such as wind, solar, mini-hydel and gobar gas, LPG in villages and CNG in cities, together with traditional knowledge, biocomposting and biopest control. They replace polluting fuels and chemicals with renewable, local and low-cost alternatives that reduce environmental damage while meeting needs.
| Strategy | How it helps | Note |
|---|---|---|
| Non-conventional energy | Thermal plants emit carbon dioxide and fly ash; large hydro projects submerge forests | Wind has no emissions but high initial cost; solar photovoltaic cells suit remote areas; mini-hydel plants serve local needs and avoid transmission loss |
| LPG and gobar gas in villages | Replace wood and dung cake; cut deforestation and indoor pollution | Gobar gas leaves slurry that is good organic fertiliser |
| CNG in cities | Cleaner public transport, as in Delhi | Lowers urban air pollution |
| Traditional knowledge | About 15,000 plant species have medicinal properties, around 8,000 in regular use | Ayurveda, Unani and folk systems are back in demand |
| Biocomposting | Compost and vermicompost replace chemical fertilisers | Earthworms speed composting; cuts waste too |
| Biopest control | Neem-based pesticides, mixed cropping, crop rotation, use of natural predators like snakes and owls | Reduces contamination of food and water |
Why local, low-cost solutions matter
Many of the strategies in this section work most effectively at the local level. A gobar gas plant uses dung from the family’s own cattle, a mini-hydel plant uses a nearby stream, and compost is made from farm waste. These solutions use local resources, need little transport and create local jobs, and they are often cheaper than imported inputs.
Their limits are cost of initial set-up, the need for skills, and lack of credit. Governments therefore support them through subsidies and loans. Policy should also respect traditional knowledge, since practices such as mixed cropping and the use of neem were developed over generations in response to local conditions.
Worked Examples
Example 1: The forest land gap
- Given
- India has 0.08 hectare of forest land per person against a requirement of 0.47 hectare.
- Formula
- Gap = required − available; ratio = required ÷ available
- Steps
- 0.47 − 0.08 = 0.39. 0.47 ÷ 0.08 = 5.9.
- Answer
- The shortfall is 0.39 hectare a person; the requirement is nearly 6 times what is available.
Example 2: Nutrients lost to soil erosion
- Given
- Each year erosion removes 0.8 million tonnes of nitrogen, 1.8 million of phosphorus and 26.3 million of potassium.
- Formula
- Total loss = N + P + K
- Steps
- 0.8 + 1.8 + 26.3 = 28.9.
- Answer
- About 28.9 million tonnes of nutrients are lost every year.
Example 3: A sustainable harvest (illustrative)
- Given
- A fishery has 1,000 tonnes of fish that regenerate at 10 per cent a year. Fishers take 150 tonnes.
- Formula
- Sustainable yield = stock × regeneration rate; overharvest = catch − sustainable yield
- Steps
- Sustainable yield = 1,000 × 0.10 = 100 tonnes. Overharvest = 150 − 100 = 50 tonnes.
- Answer
- The catch exceeds regeneration by 50 tonnes, so the stock shrinks and future yields fall.
Example 4: Fuelwood saved by LPG (illustrative)
- Given
- A household burns 6 kg of wood a day. LPG replaces it in 10,000 households.
- Formula
- Wood saved = daily use × 365 × households
- Steps
- 6 × 365 = 2,190 kg a household a year. 2,190 × 10,000 = 2,19,00,000 kg = 21,900 tonnes.
- Answer
- About 21,900 tonnes of wood are saved each year, easing pressure on forests.
Common Mistakes
- Treating all resources as renewable. Fossil fuels and minerals are not.
- Confusing carrying capacity (limit on extraction) with absorptive capacity (limit on waste).
- Saying sustainable development means stopping development. It means development that lasts.
- Describing gobar gas as only a fuel; the slurry is also a useful fertiliser.
10 Important Questions for Class 11 Board and School Examinations
Questions are written in original words. Marks are shown beside each question.
Q1Which is a renewable resource? (a) coal (b) petroleum (c) trees in a forest (d) natural gas 1 mark · MCQ
The correct option is (c) trees in a forest, if not cut faster than they regrow.
Q2The Brundtland Commission’s report was titled (a) Silent Spring (b) Our Common Future (c) Limits to Growth (d) Small is Beautiful 1 mark · MCQ
The correct option is (b) Our Common Future.
Q3Assertion (A): Water has become an economic good. Reason (R): Rivers and aquifers have been polluted and depleted. Which is correct? 1 mark · Assertion-reason
Both A and R are true, and R explains A.
Q4State the four functions of the environment. 3 marks
The environment performs four functions: it supplies resources, assimilates waste, sustains life and provides aesthetic services.
- Resources: renewable resources like forests and fish and non-renewable resources like fossil fuels.
- It absorbs waste and pollution within its absorptive capacity.
- It sustains life by providing genetic and biodiversity.
- It offers scenery and recreation.
It can perform them all only while demands stay within its carrying capacity.
Q5Distinguish between renewable and non-renewable resources with examples. 3 marks
Renewable resources can be used without being exhausted if extraction does not exceed regeneration, while non-renewable resources are used up by extraction.
- Renewable: trees in forests and fish in the ocean, if cut or caught more slowly than they regrow.
- Non-renewable: coal, petroleum and minerals, which are depleted with use.
- Overuse can turn a renewable resource into an exhausted one.
Sustainable development requires extracting renewables no faster than they regenerate.
Q6Explain carrying capacity and absorptive capacity. 4 marks
Carrying capacity is the limit of resource extraction and waste generation that the environment can sustain, and absorptive capacity is its ability to absorb degradation.
- Carrying capacity means extraction does not exceed the rate of regeneration and wastes stay within the assimilating capacity.
- Absorptive capacity means the environment can take in pollution without lasting harm.
- Earlier, demand for environmental resources was well below supply, so pollution stayed within these limits.
- Population growth and industrialisation reversed this, so both limits are now crossed in many places.
Beyond them the environment fails to sustain life.
Q7What are the causes of land degradation in India? 4 marks
Land in India suffers from degradation caused by unstable use and inappropriate management.
- Loss of vegetation through deforestation and encroachment on forests.
- Unsustainable extraction of fuelwood and fodder, shifting cultivation, forest fires and overgrazing.
- Poor soil conservation and improper crop rotation, plus heavy use of agro-chemicals.
- Poor planning of irrigation and over-extraction of groundwater.
- Open access to resources and the poverty of agriculture-dependent people.
Per capita forest land is 0.08 hectare against a need of 0.47, and soil erodes at 5.3 billion tonnes a year.
Q8Explain sustainable development and the conditions suggested by Herman Daly. 6 marks
Sustainable development means meeting the needs of the present generation without compromising the ability of future generations to meet their own.
- The Brundtland Commission defined it in Our Common Future and stressed meeting the basic needs of all, especially the poor.
- Herman Daly’s first condition: limit population to the carrying capacity, like a ship’s Plimsoll line.
- Technological progress should be input-efficient, not input-consuming.
- Renewable resources should be extracted no faster than they regenerate.
- Non-renewable resources should be depleted no faster than renewable substitutes are created.
- Inefficiencies caused by pollution should be corrected.
The present generation should leave a stock of quality-of-life assets no less than it inherited.
Sustainable development thus links today’s fight against poverty with the protection of resources for the future.
Q9Describe any four strategies of sustainable development. 6 marks
Strategies for sustainable development include cleaner energy, cleaner household and urban fuels, traditional knowledge, biocomposting and biopest control.
- Non-conventional energy: wind, solar photovoltaic and mini-hydel plants replace polluting thermal and large hydro power.
- LPG and gobar gas in villages replace wood and dung; gobar gas also leaves slurry that is good fertiliser.
- CNG in city transport, as in Delhi, has lowered air pollution.
- Biocomposting with organic waste and earthworms replaces chemical fertilisers.
- Biopest control uses neem products, mixed cropping and natural predators such as owls and snakes.
Traditional knowledge, such as medicinal plants, is also an environment-friendly resource.
Each of these strategies cuts pollution or resource use while meeting needs, and many are cheaper and more local than conventional alternatives. Wider adoption depends on credit, awareness and supporting infrastructure.
Q10A forest regenerates 8 per cent a year from a stock of 5,000 tonnes of timber. Loggers take 500 tonnes a year. Find the sustainable yield and the annual overharvest. 4 marks · Numerical
The sustainable yield is 400 tonnes and the overharvest is 100 tonnes a year.
Steps: 5,000 × 0.08 = 400; 500 − 400 = 100.
10 Points for State PSC and UPSC Aspirants
- The Water Act (1974) and Air Act (1981) created pollution control boards; the Environment (Protection) Act, 1986 followed the Bhopal gas tragedy of 1984.Why it matters: the main pollution laws.Source: India Code; PIB
- The National Green Tribunal was set up in 2010 to hear environmental cases quickly.Why it matters: a specialised environmental court.Source: PIB
- The Brundtland Commission (Our Common Future, 1987) defined sustainable development; the Rio Earth Summit (1992) and the UN SDGs (2015, 17 goals for 2030) carried it forward.Why it matters: key milestones.Source: United Nations; PIB
- The Kyoto Protocol (1997) set emission cuts for industrialised countries; the Paris Agreement (2015) asks all countries for national climate pledges; India aims for net zero by 2070.Why it matters: climate agreements and India’s targets.Source: PIB
- The Montreal Protocol (1987) phases out ozone-depleting substances.Why it matters: the successful ozone treaty.Source: UN Environment Programme
- Chipko began in Uttarakhand in the early 1970s, associated with Sunderlal Bahuguna and Gaura Devi; Appiko began in Karnataka in 1983.Why it matters: environmental movements.Source: NCERT
- The Wildlife Protection Act (1972), Forest Conservation Act (1980) and Biological Diversity Act (2002) protect species and forests.Why it matters: biodiversity laws.Source: India Code
- The National Clean Air Programme (2019) targets cuts in particulate pollution in cities; BS-VI fuel norms began in April 2020.Why it matters: urban air pollution policy.Source: PIB
- The National Action Plan on Climate Change (2008) has eight missions including solar, energy efficiency and sustainable agriculture; Mission LiFE (2022) promotes sustainable lifestyles.Why it matters: India’s climate framework.Source: PIB
- Delhi’s shift of public transport to CNG followed Supreme Court orders in the late 1990s; Ujjwala promotes LPG in homes.Why it matters: the clean fuel strategies in the chapter.Source: PIB; NCERT
These are revision notes, not official predictions of exam content.
Quick Revision
- Environment functions: resources, waste, life, aesthetic.
- Carrying capacity and absorptive capacity.
- Renewable vs non-renewable resources.
- India: land degradation, biodiversity loss, air and water pollution, solid waste.
- Sustainable development: meet present needs without harming future generations.
- Strategies: clean energy, LPG, CNG, biocompost, biopest control.
- CPCB set up in 1974.
Related Glossary Terms and Chapters
Glossary:
Sustainable developmentCarrying capacityAbsorptive capacityGlobal warming
Related chapters: Rural Development, for organic farming; Infrastructure, for energy sources and their environmental effects.
Sources
- NCERT textbooks: Indian Economic Development, Class 11, National Council of Educational Research and Training. Syllabus reference. Accessed 23 October 2026.
- India Code: Central Acts, Legislative Department, Government of India. Accessed 23 October 2026.
- Press Information Bureau, Government of India. Accessed 23 October 2026.
- Economic Survey, Ministry of Finance, Government of India. Accessed 23 October 2026.
- NITI Aayog, Government of India. Accessed 23 October 2026.
About this page
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Syllabus year 2026-27 · Last updated