Exercise Solutions Available
Step-by-step answers for all textbook questions in this chapter
How to Use This Page
Read each textbook exercise question, attempt your own answer first, and then compare with the solutions below. Focus on understanding the reasoning behind each answer — especially for MCQs and True/False items — rather than memorising options alone. Use the Key Concepts recap and Exam Checklist to ensure full chapter coverage before your board exam.
Key Concepts (Quick Recap)
- Environment and economy linkage — the economy is a subsystem of the environment; all economic activity depends on natural resources and ecosystem services
- Externalities — spillover effects (positive or negative) on third parties not involved in a market transaction
- Negative externality — costs imposed on others, e.g. pollution, noise, congestion
- Positive externality — benefits accruing to others, e.g. vaccination, education, bee-keeping near orchards
- Pollution types — air, water, noise, and soil/land pollution with distinct sources and impacts
- Sustainable development — meeting present needs without compromising future generations' ability to meet theirs (Brundtland Commission, 1987)
- Green GDP — GDP adjusted for environmental degradation and natural resource depletion
- Polluter Pays Principle — the party responsible for pollution should bear the costs of managing it
- Tragedy of the Commons — overuse of common resources when no individual has an incentive to conserve (Hardin, 1968)
- Environmental Impact Assessment (EIA) — systematic evaluation of a project's environmental consequences before approval
- Carbon trading / cap-and-trade — market mechanism where firms buy and sell permits to emit a capped quantity of CO2
- International agreements — Kyoto Protocol (1997), Paris Agreement (2015), Montreal Protocol (1987)
I. Choose the Best Answer (MCQs)
Q1. Which of the following is an example of a negative externality?
- (a) A bee-keeper's bees pollinating neighbouring farms
- (b) A factory releasing toxic chemicals into a river
- (c) A person getting vaccinated against a disease
- (d) A homeowner maintaining a beautiful garden
Q2. Sustainable development is defined as development that
- (a) Maximises GDP growth at any cost
- (b) Meets the needs of the present without compromising future generations' ability to meet their own needs
- (c) Focuses only on industrial expansion
- (d) Prioritises short-term economic gains
Q3. Green GDP is calculated by
- (a) Adding environmental benefits to GDP
- (b) Subtracting the cost of environmental damage and resource depletion from traditional GDP
- (c) Multiplying GDP by the green cover percentage
- (d) Adding the value of renewable energy output to GDP
Q4. The "Tragedy of the Commons" refers to
- (a) Overuse of common-pool resources when individuals act in their self-interest
- (b) A tragedy that occurs in common agricultural markets
- (c) The collapse of stock markets during a recession
- (d) Government failure in regulating private property
Q5. The Polluter Pays Principle means
- (a) The government pays for pollution control
- (b) The consumer pays higher prices for all goods
- (c) Those who produce pollution should bear the cost of managing it
- (d) Only foreign polluters are penalised
Q6. Which of the following is a renewable resource?
- (a) Coal
- (b) Natural gas
- (c) Solar energy
- (d) Petroleum
Q7. The Kyoto Protocol (1997) primarily deals with
- (a) International trade regulations
- (b) Reduction of greenhouse gas emissions
- (c) Protection of marine biodiversity
- (d) Nuclear non-proliferation
Q8. Environmental Impact Assessment (EIA) is
- (a) An assessment conducted after a project is completed
- (b) A systematic evaluation of a project's environmental consequences before approval
- (c) A financial audit of environmental NGOs
- (d) A measure of GDP adjusted for pollution
Q9. Which of the following is an example of a positive externality?
- (a) Noise from a construction site
- (b) Smoke from a factory chimney
- (c) Education benefiting society beyond the individual
- (d) Congestion on a public road
Q10. Carbon trading is a market mechanism that
- (a) Bans all carbon emissions
- (b) Sets a cap on total emissions and allows firms to buy and sell emission permits
- (c) Taxes carbon at a uniform rate across all countries
- (d) Provides free carbon permits to all industries
II. Fill in the Blanks
Q1. The economy is a ________ of the environment.
Q2. A cost imposed on third parties not involved in a market transaction is called a ________ externality.
Q3. ________ development meets the needs of the present without compromising the ability of future generations to meet their own needs.
Q4. ________ GDP is obtained by subtracting the cost of environmental damage and natural resource depletion from traditional GDP.
Q5. The ________ Pays Principle states that those who produce pollution should bear the cost of managing it.
Q6. The ________ of the Commons describes the overuse of shared resources when individuals act in their self-interest.
Q7. The ________ Protocol (1997) is an international agreement aimed at reducing greenhouse gas emissions.
Q8. Renewable resources are those that can be naturally ________ within a human lifetime.
Q9. ________ Impact Assessment evaluates a project's environmental consequences before it is approved.
Q10. The ________ movement was a forest conservation movement in India where people hugged trees to prevent logging.
III. True or False
Q1. The environment and the economy are completely independent systems.
Q2. Positive externalities benefit third parties who are not part of the transaction.
Q3. Green GDP is always higher than traditional GDP.
Q4. The Polluter Pays Principle shifts the cost of pollution from society to the polluter.
Q5. The Tragedy of the Commons leads to under-use of common resources.
Q6. The Paris Agreement (2015) aims to limit global temperature rise to well below 2 degrees Celsius above pre-industrial levels.
Q7. Environmental economics treats the environment as a free and unlimited resource.
Q8. Carbon trading is also known as cap-and-trade.
IV. Match the Following
Match Q1
| Column I | Column II | ||
|---|---|---|---|
| (i) | Negative externality | (1) | Benefits spill over to third parties |
| (ii) | Positive externality | (2) | Costs imposed on third parties |
| (iii) | Tragedy of the Commons | (3) | Adjusts GDP for environmental damage |
| (iv) | Green GDP | (4) | Overuse of shared resources |
| (v) | Polluter Pays Principle | (5) | Polluter bears the cost of pollution |
- (i) — 2: Negative externality → Costs imposed on third parties
- (ii) — 1: Positive externality → Benefits spill over to third parties
- (iii) — 4: Tragedy of the Commons → Overuse of shared resources
- (iv) — 3: Green GDP → Adjusts GDP for environmental damage
- (v) — 5: Polluter Pays Principle → Polluter bears the cost of pollution
Match Q2
| Column I | Column II | ||
|---|---|---|---|
| (i) | Chipko Movement | (1) | International emission reduction agreement (1997) |
| (ii) | Kyoto Protocol | (2) | Limit global warming to well below 2 degrees C (2015) |
| (iii) | Paris Agreement | (3) | Hugging trees to prevent logging |
| (iv) | EIA | (4) | Market mechanism for carbon permits |
| (v) | Cap-and-trade | (5) | Systematic evaluation before project approval |
- (i) — 3: Chipko Movement → Hugging trees to prevent logging
- (ii) — 1: Kyoto Protocol → International emission reduction agreement (1997)
- (iii) — 2: Paris Agreement → Limit global warming to well below 2 degrees C (2015)
- (iv) — 5: EIA → Systematic evaluation before project approval
- (v) — 4: Cap-and-trade → Market mechanism for carbon permits
V. Answer Briefly
Q1. Define externality. Give one example each of a positive and a negative externality.
An externality is a consequence of an economic activity that affects third parties who are not directly involved in the transaction. Externalities represent a market failure because they are not reflected in market prices. Positive externality example: Education — when a person gets educated, society benefits through a more informed electorate, lower crime rates, and higher productivity. The social benefit exceeds the private benefit. Negative externality example: Pollution from a factory — the factory owner does not bear the full cost of production; nearby residents suffer health problems and degraded living conditions without compensation. The social cost exceeds the private cost.
Q2. What is sustainable development? Why is it important?
Sustainable development is development that meets the needs of the present generation without compromising the ability of future generations to meet their own needs (Brundtland Commission, 1987). It is important because: 1. Intergenerational equity — future generations have an equal right to natural resources and a healthy environment. 2. Resource limits — many natural resources (fossil fuels, clean water, fertile soil) are finite and can be exhausted. 3. Ecological balance — uncontrolled exploitation disrupts ecosystems, leading to climate change, species extinction, and natural disasters. 4. Long-term welfare — short-term GDP growth that destroys the environment reduces future welfare and economic potential.
Q3. What is Green GDP? How does it differ from traditional GDP?
Green GDP is a measure of economic growth that adjusts traditional GDP by subtracting the monetary value of environmental degradation and natural resource depletion. Formula: Green GDP = GDP − (cost of environmental damage + cost of resource depletion) | Aspect | Traditional GDP | Green GDP | |---|---|---| | What it measures | Total market value of goods and services | Market value minus environmental costs | | Environmental costs | Ignored | Subtracted | | Resource depletion | Not accounted for | Deducted | | Accuracy of welfare | Overstates true welfare | More realistic welfare measure | Green GDP provides a more accurate picture of whether economic growth is truly improving welfare or merely consuming natural capital.
Q4. Explain the Polluter Pays Principle.
The Polluter Pays Principle (PPP) states that those who produce pollution should bear the costs of managing it to prevent damage to human health or the environment. It was adopted by the OECD in 1972. Purpose: To internalise negative externalities by shifting the cost from affected third parties to the polluter. When a factory pollutes a river, under PPP the factory must pay for the cleanup and compensation — not the affected community or the government. Methods of implementation: Pollution taxes, effluent charges, cleanup mandates, and liability for environmental damage. The PPP ensures that the price of goods and services reflects their true social cost, leading to more efficient resource allocation and reduced pollution.
Q5. What is the Tragedy of the Commons? Give an example.
The Tragedy of the Commons, introduced by Garrett Hardin (1968), describes a situation where a shared resource is overexploited because each individual user has an incentive to maximise their own use, even though collective overuse leads to the resource's depletion and ultimately harms everyone. Example: Overfishing in the open ocean — no single fisher owns the ocean, so each fisher tries to catch as many fish as possible. The result is depletion of fish stocks, which harms all fishers in the long run. Solutions: Regulation (fishing quotas), privatisation (assigning property rights), community management (cooperative agreements among users), and Pigouvian taxes (charging for use of the commons).
Q6. Distinguish between renewable and non-renewable resources.
| Aspect | Renewable Resources | Non-renewable Resources | |---|---|---| | Definition | Can be naturally replenished within a human lifetime | Cannot be replenished once depleted (or take millions of years) | | Examples | Solar energy, wind energy, timber, freshwater | Coal, petroleum, natural gas, minerals | | Supply | Potentially infinite if managed sustainably | Finite and diminishing | | Exhaustion risk | Can be overexploited but can recover with proper management | Once exhausted, cannot be replaced | | Economic implication | Sustainable use supports long-term growth | Depletion raises intergenerational equity concerns |
Q7. What is Environmental Impact Assessment (EIA)?
Environmental Impact Assessment (EIA) is a systematic process for evaluating the potential environmental consequences of a proposed project or development before a decision is made to proceed. It identifies, predicts, and assesses the likely biophysical and social effects of a project. Key stages of EIA: 1. Screening — deciding whether an EIA is required 2. Scoping — identifying which impacts need detailed study 3. Impact assessment — predicting the nature and magnitude of effects 4. Mitigation — proposing measures to reduce adverse impacts 5. Reporting — preparing the Environmental Impact Statement 6. Decision-making — approving, modifying, or rejecting the project 7. Monitoring — tracking actual impacts during and after the project In India, EIA was mandated through the Environmental Protection Act, 1986, and the EIA Notification of 1994 (updated 2006).
Q8. Briefly describe the Chipko Movement.
The Chipko Movement was a grassroots forest conservation movement that began in 1973 in the Reni village of Uttarakhand (then part of Uttar Pradesh). The word "Chipko" means "to hug" in Hindi. Key features: - Local women hugged trees to prevent commercial logging contractors from cutting them down. - Led by Sunderlal Bahuguna and Chandi Prasad Bhatt. - Emphasised the ecological importance of forests for soil conservation, water retention, and local livelihoods. - Successfully led to a 15-year ban on commercial green felling in the Himalayan forests (1980). The Chipko Movement is a landmark example of people's participation in environmental protection and inspired similar movements worldwide.
VI. Answer in Detail
Q1. Explain the relationship between the environment and the economy.
The economy and the environment are deeply interconnected — the economy is a subsystem of the environment, not separate from it. Their relationship operates through four key functions: 1. Source function (Supply of Resources): The environment provides raw materials and energy inputs for all economic activity — fossil fuels, minerals, timber, water, soil, and biological resources. Without these inputs, no production is possible. 2. Sink Function (Absorption of Waste): The environment absorbs and assimilates the waste generated by economic activity — carbon dioxide, industrial effluents, solid waste, and heat. When waste exceeds the environment's assimilative capacity, pollution results. 3. Service Function (Life-Support): The environment provides essential life-support services — clean air, climate regulation, ozone layer protection, pollination, flood control, and water purification. These services have no market price but are invaluable. 4. Amenity Function (Quality of Life): The environment provides aesthetic, recreational, and cultural value — landscapes, biodiversity, and natural beauty that contribute to human well-being. | Relationship | Description | |---|---| | Economy depends on environment | All inputs come from nature; all waste returns to nature | | Environment sets limits | Finite resources and sink capacity constrain economic growth | | Economic activity degrades environment | Pollution, deforestation, and overexploitation damage ecological systems | | Environmental damage reduces economic potential | Resource depletion and health costs lower future GDP | Key insight: When the environment is treated as a free and unlimited resource, markets fail (negative externalities, tragedy of the commons). Environmental economics corrects this by internalising environmental costs and recognising ecological limits.
Q2. Discuss the different types of pollution and their economic effects.
Pollution is the contamination of the environment by harmful substances or excessive energy, resulting in damage to living organisms and ecosystems. The four major types are: 1. Air Pollution: - Sources: Industrial emissions, vehicle exhaust, power plants, agricultural burning, construction dust. - Major pollutants: CO2, SO2, NOx, PM2.5, PM10, CO, ozone. - Economic effects: Health costs (respiratory diseases, reduced life expectancy), reduced agricultural productivity (acid rain damages crops), corrosion of buildings and infrastructure, lost labour productivity due to illness. - Example: Delhi's air pollution crisis costs an estimated Rs 10,000 crore annually in health-related expenses. 2. Water Pollution: - Sources: Industrial effluents, agricultural runoff (fertilisers, pesticides), untreated sewage, oil spills, mining discharge. - Major pollutants: Heavy metals, organic waste, pathogens, chemicals, thermal pollution. - Economic effects: Cost of water treatment, loss of fisheries, reduced tourism revenue, health expenditures (waterborne diseases), decreased agricultural productivity from contaminated irrigation. - Example: The Ganga Action Plan was launched because pollution in the Ganga affected 400 million people dependent on it. 3. Noise Pollution: - Sources: Transport (road, rail, air traffic), industrial machinery, construction activity, loudspeakers. - Economic effects: Health costs (hearing loss, stress, hypertension, sleep disorders), reduced property values in noisy areas, decreased worker productivity, learning difficulties in children near noisy environments. 4. Soil/Land Pollution: - Sources: Industrial waste dumping, excessive use of chemical fertilisers and pesticides, mining, improper solid waste disposal, e-waste. - Economic effects: Loss of agricultural productivity, cost of soil remediation, contamination of groundwater, health costs from toxic exposure, reduced land value. | Pollution Type | Key Source | Primary Economic Cost | |---|---|---| | Air | Industrial emissions, vehicles | Health expenditure, lost productivity | | Water | Industrial effluents, sewage | Water treatment, disease burden | | Noise | Transport, machinery | Health costs, reduced property value | | Soil | Chemicals, waste dumping | Agricultural loss, remediation cost |
Q3. Explain externalities in detail with examples. How can negative externalities be corrected?
Definition: An externality is a cost or benefit arising from an economic activity that affects third parties who are not part of the transaction and whose interests are not reflected in market prices. Types of Externalities: | Type | Effect on Third Party | Example | |---|---|---| | Negative production externality | Cost imposed | Factory pollution harming nearby residents | | Negative consumption externality | Cost imposed | Loud music disturbing neighbours | | Positive production externality | Benefit provided | Bee-keeping pollinating neighbouring orchards | | Positive consumption externality | Benefit provided | Vaccination reducing community disease spread | Negative Externalities in Detail: - Occur when the social cost exceeds the private cost. - Lead to overproduction — the market produces more than the socially optimal quantity because the producer does not bear the full cost. - Create a deadweight loss to society. - Examples: Air pollution from factories, water contamination from agricultural runoff, traffic congestion, second-hand smoke, noise from construction. Positive Externalities in Detail: - Occur when the social benefit exceeds the private benefit. - Lead to underproduction — the market produces less than the socially optimal quantity because the producer does not capture the full benefit. - Examples: Education (informed citizenry), research and development (knowledge spillovers), vaccination (herd immunity), tree planting (carbon sequestration, shade). Methods to Correct Negative Externalities: 1. Pigouvian Tax: A tax equal to the marginal external cost, imposed on the polluter. This internalises the externality by making the polluter pay the full social cost. Example: Carbon tax on fossil fuel emissions. 2. Cap-and-Trade (Emissions Trading): A regulatory cap sets the total allowable emissions; permits are distributed or auctioned and can be traded. Firms that reduce emissions below their allowance can sell permits; those that exceed must buy permits. 3. Command-and-Control Regulation: Government sets emission standards, technology mandates, or bans on harmful substances. Example: Bharat Stage emission norms for vehicles. 4. Subsidies for Positive Alternatives: Government provides subsidies for clean technology, renewable energy, or public transport to make them more attractive relative to polluting alternatives. 5. Property Rights Assignment (Coase Theorem): If property rights are clearly defined and transaction costs are low, private parties can negotiate an efficient solution regardless of who holds the initial rights. 6. Polluter Pays Principle: Legally mandates that the polluter bear the full cost of pollution prevention and remediation.
Q4. Describe the major environmental policies and legislation in India.
India has enacted a comprehensive framework of environmental legislation and policies: 1. The Wildlife Protection Act, 1972: - Establishes protected areas (national parks, wildlife sanctuaries). - Regulates hunting and trade of endangered species. - Created the National Board for Wildlife. 2. The Water (Prevention and Control of Pollution) Act, 1974: - Established the Central and State Pollution Control Boards. - Regulates discharge of pollutants into water bodies. - Requires consent from SPCBs for industrial effluent discharge. 3. The Air (Prevention and Control of Pollution) Act, 1981: - Regulates air pollution from industrial and vehicular sources. - Empowers SPCBs to set emission standards and inspect premises. 4. The Environmental Protection Act, 1986: - Umbrella legislation enabling the Central Government to take measures for environmental protection. - Empowers the government to set standards, restrict industrial operations, and prescribe procedures for hazardous waste management. - Basis for the EIA notification (1994, updated 2006). 5. The Forest Conservation Act, 1980: - Restricts diversion of forest land for non-forest purposes. - Requires Central Government approval for any such diversion. 6. National Environment Policy, 2006: - Comprehensive policy framework for environmental management. - Key principles: polluter pays, precautionary approach, intergenerational equity. - Aims to correct market failures and integrate environmental concerns into development planning. 7. National Action Plan on Climate Change (NAPCC), 2008: - Eight national missions including Solar Energy, Enhanced Energy Efficiency, Sustainable Agriculture, Water, Himalayan Ecosystem, Green India, Sustainable Habitat, and Strategic Knowledge for Climate Change. | Legislation | Year | Key Focus | |---|---|---| | Wildlife Protection Act | 1972 | Biodiversity conservation | | Water Act | 1974 | Water pollution control | | Air Act | 1981 | Air pollution control | | Environmental Protection Act | 1986 | Comprehensive environmental protection | | Forest Conservation Act | 1980 | Preventing deforestation | | National Environment Policy | 2006 | Policy framework and principles | | NAPCC | 2008 | Climate change action |
Q5. Explain the concepts of carbon trading and the major international environmental agreements.
Carbon Trading (Cap-and-Trade): Carbon trading is a market-based mechanism to reduce greenhouse gas emissions. It works as follows: 1. Cap: A regulatory authority (government or international body) sets a maximum limit (cap) on total emissions allowed in a given period. 2. Allocation: Emission permits are distributed (free allocation or auction) to firms, each permit allowing the holder to emit a specific quantity of CO2. 3. Trade: Firms that reduce emissions below their permit allocation can sell surplus permits. Firms that exceed their allocation must buy additional permits. 4. Compliance: At the end of the period, every firm must surrender enough permits to cover its actual emissions. Advantages: - Achieves emission reductions at the lowest cost (firms with low abatement costs reduce more and sell permits). - Provides certainty about total emissions (the cap). - Creates a financial incentive for clean technology investment. Disadvantages: - Setting the right cap level is difficult. - Permit price volatility can reduce investment certainty. - Risk of "carbon leakage" (firms relocate to countries without caps). Major International Environmental Agreements: | Agreement | Year | Key Provisions | |---|---|---| | Montreal Protocol | 1987 | Phase-out of ozone-depleting substances (CFCs, HCFCs). Most successful environmental agreement — ozone layer recovering. | | UN Framework Convention on Climate Change (UNFCCC) | 1992 | Established the framework for international climate negotiations. Annual COP meetings. | | Kyoto Protocol | 1997 | Legally binding emission targets for developed countries (Annex I). Introduced Clean Development Mechanism (CDM), Joint Implementation (JI), and Emissions Trading (ET). India ratified but had no binding targets. | | Paris Agreement | 2015 | Goal: limit warming to well below 2 degrees C (aim for 1.5 degrees C). Nationally Determined Contributions (NDCs) — each country sets its own targets. 196 parties signed. India committed to 40% renewable energy by 2030 and reducing emission intensity by 33–35%. | | Convention on Biological Diversity | 1992 | Conservation of biodiversity, sustainable use of biological resources, fair sharing of genetic resource benefits. | India's commitments under the Paris Agreement: 1. Reduce emission intensity of GDP by 33–35% from 2005 levels by 2030. 2. Achieve 40% cumulative electric power capacity from non-fossil fuel sources by 2030. 3. Create an additional carbon sink of 2.5–3 billion tonnes of CO2 equivalent through additional forest and tree cover by 2030.
Common Mistakes to Avoid
1. Confusing positive and negative externalities: A negative externality imposes a cost on third parties (pollution, noise); a positive externality provides a benefit to third parties (education, vaccination, bee-keeping). Do not mix these up in MCQs and short answers.
2. Green GDP is lower than traditional GDP, not higher: Green GDP subtracts environmental damage costs from GDP, so it is always less than or equal to traditional GDP. Never write that Green GDP adds something — it deducts degradation costs.
3. Tragedy of the Commons means overuse, not underuse: The commons are overexploited because each user gains individually from using more, but everyone shares the cost of depletion. The result is depletion, not conservation or underuse.
4. Sustainable development is not just "development that continues": Use the precise Brundtland definition — "meeting the needs of the present without compromising the ability of future generations to meet their own needs." Vague definitions lose marks.
5. EIA is conducted BEFORE a project, not after: Environmental Impact Assessment is a preventive tool, not a post-project audit. It evaluates potential impacts and proposes mitigation before a decision is made to proceed.
6. Polluter Pays does not mean the government pays: The principle clearly states that the polluter (the party causing pollution) pays — not the government, not the consumer, and not the affected community. It internalises the cost by assigning it to the source.
Exam Checklist
- [ ] Can you define externality and distinguish positive from negative externalities with examples?
- [ ] Can you state the Brundtland definition of sustainable development verbatim?
- [ ] Can you define Green GDP and explain how it differs from traditional GDP?
- [ ] Can you explain the Polluter Pays Principle and its purpose?
- [ ] Can you describe the Tragedy of the Commons with an example?
- [ ] Can you list and explain the four types of pollution (air, water, noise, soil) with economic effects?
- [ ] Can you name the major environmental legislations in India with their years and key provisions?
- [ ] Can you explain carbon trading (cap-and-trade) and distinguish the Kyoto Protocol from the Paris Agreement?
- [ ] Can you describe the Chipko Movement and the Narmada Bachao Andolan as case studies of environmental activism?
- [ ] Can you list at least three methods of correcting negative externalities (Pigouvian tax, cap-and-trade, regulation, subsidies, Coase theorem)?