Energy & Environmental Engineering (ES-301) Unit 5 Notes

How unit 5 is examined

Sustainable development, climate and ozone issues, and the Indian environmental Acts carry the marks; water, R&R and ethics come as 7-mark notes.

From Unsustainable to Sustainable development

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">High weight</span>

Definition. <mark>Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs (Brundtland Commission, "Our Common Future", 1987).</mark> Sustainability is the long-term capacity of the environment, society and economy to keep supporting life and well-being.

Diagram.

<figure class="ds-fig" style="margin:1.4rem 0;overflow-x:auto"><svg xmlns="http://www.w3.org/2000/svg" id="dsfig-u5-01" viewBox="0 0 338 252" width="338" height="252" role="img" aria-label="Three pillars of sustainability. Env = environmental, Soc = social, Eco = economic; SD = sustainable development"><style>#dsfig-u5-01 .e{stroke:#454C5A;stroke-width:1.4;fill:none}#dsfig-u5-01 .e.hi{stroke:#2340B8;stroke-width:2.6}#dsfig-u5-01 .n{fill:#FFFFFF;stroke:#16181D;stroke-width:1.4}#dsfig-u5-01 .n.hi{fill:#E3E9FC;stroke:#2340B8;stroke-width:2.2}#dsfig-u5-01 .n.rb-b{fill:#16181D;stroke:#16181D}#dsfig-u5-01 .n.rb-r{fill:#BD3227;stroke:#BD3227}#dsfig-u5-01 text{font-family:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;font-size:13px}#dsfig-u5-01 .t{fill:#16181D;font-weight:500}#dsfig-u5-01 .t.inv{fill:#FFFFFF;font-weight:700}#dsfig-u5-01 .kd{stroke:#16181D;stroke-width:1.2}#dsfig-u5-01 .dot{fill:#16181D}#dsfig-u5-01 .ann{fill:#2340B8;font-size:11px;font-weight:700}#dsfig-u5-01 .lbl{fill:#6F7787;font-family:system-ui,-apple-system,sans-serif;font-size:12px;font-weight:700}#dsfig-u5-01 .ptr{fill:#2340B8;font-size:12px;font-weight:700}#dsfig-u5-01 .ah{fill:#454C5A}#dsfig-u5-01 .ah.hi{fill:#2340B8}#dsfig-u5-01 .wl rect{fill:#FFFFFF;stroke:#DCE0E7}#dsfig-u5-01 .wl .t{font-size:12px;font-weight:700}#dsfig-u5-01 .wl.hi rect{fill:#2340B8;stroke:#2340B8}#dsfig-u5-01 .wl.hi .t{fill:#FFFFFF}html.dark #dsfig-u5-01 .e{stroke:#B1B7C3}html.dark #dsfig-u5-01 .e.hi{stroke:#8FA3FF}html.dark #dsfig-u5-01 .n{fill:#161920;stroke:#E6E8ED}html.dark #dsfig-u5-01 .n.hi{fill:#1E2748;stroke:#8FA3FF}html.dark #dsfig-u5-01 .n.rb-b{fill:#E6E8ED;stroke:#E6E8ED}html.dark #dsfig-u5-01 .n.rb-r{fill:#FF7E71;stroke:#FF7E71}html.dark #dsfig-u5-01 .t{fill:#E6E8ED}html.dark #dsfig-u5-01 .t.inv{fill:#0F1115}html.dark #dsfig-u5-01 .kd{stroke:#E6E8ED}html.dark #dsfig-u5-01 .dot{fill:#E6E8ED}html.dark #dsfig-u5-01 .ann{fill:#8FA3FF}html.dark #dsfig-u5-01 .lbl{fill:#858D9C}html.dark #dsfig-u5-01 .ptr{fill:#8FA3FF}html.dark #dsfig-u5-01 .ah{fill:#B1B7C3}html.dark #dsfig-u5-01 .ah.hi{fill:#8FA3FF}html.dark #dsfig-u5-01 .wl rect{fill:#161920;stroke:#2A2E37}html.dark #dsfig-u5-01 .wl.hi rect{fill:#8FA3FF;stroke:#8FA3FF}html.dark #dsfig-u5-01 .wl.hi .t{fill:#0F1115}</style><defs><marker id="ah8" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path class="ah" d="M0,1 L9,5 L0,9 z"/></marker><marker id="ahh8" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse"><path class="ah hi" d="M0,1 L9,5 L0,9 z"/></marker></defs><path class="e" d="M56.8,48.9 L152.2,99.9"/><path class="e" d="M281.2,48.9 L185.8,99.9"/><path class="e" d="M169,193 L169,127.8"/><circle class="n" cx="40" cy="40" r="18"/><text class="t" x="40" y="40" dy=".35em" text-anchor="middle">Env</text><circle class="n" cx="298" cy="40" r="18"/><text class="t" x="298" y="40" dy=".35em" text-anchor="middle">Soc</text><circle class="n" cx="169" cy="212" r="18"/><text class="t" x="169" y="212" dy=".35em" text-anchor="middle">Eco</text><circle class="n" cx="169" cy="108.8" r="18"/><text class="t" x="169" y="108.8" dy=".35em" text-anchor="middle">SD</text></svg><figcaption style="font-size:.82em;opacity:.72;margin-top:.45rem">Three pillars of sustainability. Env = environmental, Soc = social, Eco = economic; SD = sustainable development</figcaption></figure>

Key points.

Unsustainable development uses non-renewable resources faster than they regenerate, so it causes pollution, resource depletion, poverty and inequality.
The environmental pillar protects ecosystems, biodiversity, air, water and soil within the earth's carrying capacity.
The social pillar ensures equity, health, education, and fair access to resources for present and future generations.
The economic pillar means growth that is viable, efficient and long lasting, without exhausting natural capital.
Primary goals are resource conservation, climate change mitigation, social equity, poverty eradication, economic viability, clean energy and ecological balance.
Its significance today is that it links growth with protection, so that development does not destroy the base it depends on.
It is achieved through renewable energy, the 3Rs (reduce, reuse, recycle), pollution control, population control and public participation.
Environmental Impact Assessment (EIA) is a predictive decision-making tool that identifies, predicts and evaluates the environmental effects of a project before approval, so that harm is avoided or mitigated.
EIA steps are screening, scoping, baseline study, impact prediction, mitigation plan, public hearing, review and decision, then monitoring; this balances economic growth with ecological preservation.

Answer frame. Open with the Brundtland definition; draw the three-pillar diagram; then develop points 1-7 (goals first) with one example each such as solar power or recycling; close that sustainability is the only way to keep growth alive. For the EIA question, open with its definition, list its steps (point 9) and close on its role in sustainable development.

Pitfall: Naming only environmental protection; the examiner wants all three pillars.

Asked: [7 marks] (Dec 2023, Jun 2023, Dec 2025) What are the primary goals of sustainability? What is sustainable development? Explain its objectives and significance in modern society. Asked: [7 marks] (Dec 2024) Describe the concept of Environmental Impact Assessment (EIA) and its importance in promoting sustainable development.

Urban problems related to energy

Definition. Urban energy problems are the supply, cost and pollution issues that come from rapid growth of cities and their high energy demand.

Key points.

Rapid urbanisation raises demand for electricity, transport fuel and cooking fuel faster than supply grows, causing power cuts and load shedding.
Heavy use of fossil fuels in vehicles and power plants causes air pollution, smog and greenhouse gas emissions.
Air conditioners and concrete cause the urban heat island effect, which raises demand further.
Solutions are energy-efficient buildings, public transport, LED lighting, rooftop solar and waste-to-energy plants.

Water conservation, rain water harvesting, watershed management

Definition. A watershed is the land area that drains rainwater to a common outlet such as a stream, river or lake; it is also called a drainage basin or catchment.

Key points.

Its functions are to collect, store and slowly release water, regulate sediment and floods, recharge groundwater and support ecology.
Watershed management is the scientific use of land, water and vegetation in a watershed, by contour bunding, check dams, afforestation and terracing.
India codes watersheds hierarchically (AISLUS atlas): water resource region, basin, catchment, sub-catchment, watershed, sub-watershed, with alphanumeric codes; there are 6 regions, 35 basins and 3,237 watersheds.
Rainwater harvesting collects and stores rain, by rooftop tanks or recharge pits, wells and trenches, to raise groundwater and cut runoff.
Water conservation also means drip irrigation, reuse of wastewater and fixing leaks.

Asked: [7 marks] (Dec 2023) What is a watershed? What is the function of a watershed? Is there a code or symbol for the watersheds in the country?

Resettlement and rehabilitation of people; its problems and concerns

Definition. Resettlement and rehabilitation (R&R) is the relocation of people displaced by development projects such as dams, mines and highways, and restoring their homes and livelihoods.

Key points.

Compensation is often inadequate or delayed, and the loss of farmland and traditional livelihood leaves families poorer.
Communities are fragmented, cultural ties break, and displaced people suffer psychological trauma.
Tribals, women and the poor are marginalised most, and host areas face pressure on resources.
Remedies are a fair R&R policy, participatory planning, land-for-land, jobs, schools and health care at new sites, and proper monitoring.

Asked: [7 marks] (Dec 2023) Write a brief note on Resettlement and rehabilitation of people: Problems and Concerns. Asked: [7 marks] (Dec 2025) Write short notes on: i) Resettlement and Rehabilitation (R&R) ii) Rainwater harvesting

Environmental ethics: Issues and possible solutions

Definition. Environmental ethics is the branch of ethics that studies the moral relationship between humans and the environment and their duty to protect it.

Key points.

Its principles are respect for all life, intergenerational equity, the precautionary principle and polluter pays.
Issues include deforestation, over-consumption, pollution and loss of species for short-term profit.
It matters in decision-making because projects are judged on moral responsibility and long-term sustainability, not on cost alone.
Solutions are environmental education, strict laws, green technology and responsible consumption.

Asked: [7 marks] (Dec 2025) Explain the concept of Environmental Ethics. Discuss its importance in environmental decision-making.

Climate change, global warming, acid rain, ozone layer depletion, nuclear accidents and holocaust

Definition. <mark>Global warming is the rise in the earth's average temperature caused by greenhouse gases trapping outgoing heat; climate change is the long-term change in temperature and weather patterns it brings.</mark>

Key points.

Greenhouse effect: gases such as $CO_2$, $CH_4$, $N_2O$, CFCs and water vapour let sunlight in but trap infrared heat, warming the earth.
Causes are fossil fuel burning, deforestation, agriculture and industry.
Effects: melting ice, sea-level rise, floods, droughts, cyclones and crop loss; examples are Arctic melt and Pacific island flooding.
Mitigation: renewable energy, afforestation, efficiency, the Kyoto Protocol (1997) and Paris Agreement (2015, keep rise below 2 °C).
Acid rain is rain with pH below 5.6, formed when $SO_2$ and $NO_x$ react with water: $SO_2 + \tfrac12 O_2 \to SO_3$, $SO_3 + H_2O \to H_2SO_4$, $2NO_2 + H_2O \to HNO_3 + HNO_2$. It corrodes monuments (Taj Mahal), acidifies lakes and soil and kills fish and forests; control by scrubbers and cleaner fuels.
Ozone depletion: CFCs from refrigerators and aerosols release chlorine in the stratosphere, and one Cl atom destroys thousands of ozone molecules, making the Antarctic ozone hole. More UV-B causes skin cancer, cataract and crop damage. The Montreal Protocol (1987) phases out CFCs.
Nuclear accidents: Three Mile Island (1979), Chernobyl (1986) and Fukushima (2011) released radiation, causing deaths, cancer, contaminated land and evacuation. The "holocaust" is nuclear war, as at Hiroshima and Nagasaki (1945), causing mass death and a possible nuclear winter.
Also asked as parts of the short-note: fossil fuels (coal, oil, gas; formed from buried organisms, limited and polluting), disaster management (prepare, respond and recover from floods and quakes) and energy storage (pumped hydro, batteries).

Answer frame. For the 7-mark question, open with global warming and climate change defined; draw the greenhouse effect as sunlight in and heat trapped by gases; develop points 1-4 with examples; close with mitigation. For the short note choose four topics and give definition, cause, effect and remedy for each.

Pitfall: Confusing the greenhouse effect (natural, needed) with global warming (enhanced by humans), and ozone depletion with global warming.

Asked: [14 marks] (Nov 2019, Nov 2022) Write short notes on any four: i) Ozone layer depletion ii) Acid rain iii) Global warming iv) Disaster management v) Energy storage or regeneration. Also any two of: fossil fuels, global warming, ozone layer depletion, acid rain. Asked: [7 marks] (Dec 2025) Discuss climate change and global warming with suitable examples.

Wasteland reclamation; Consumerism and waste products

Definition. Wasteland reclamation is restoring degraded, barren land to productive use; consumerism is the habit of buying and using more goods than needed, which creates waste.

Key points.

Wastelands come from erosion, salinity, waterlogging and mining, and are reclaimed by afforestation, soil treatment and drainage.
Consumerism raises resource use and produces plastic, e-waste and packaging waste.
Waste is reduced by the 3Rs, composting and buying only what is needed.

Environment Protection Act; Air (Prevention and Control of Pollution) Act; Water (Prevention and control of Pollution) Act

Definition. <mark>The Environment (Protection) Act, 1986 is an umbrella Act, passed after the Bhopal gas tragedy (1984), that empowers the Central Government to protect and improve the environment and prevent hazards.</mark>

Key points.

Background: it follows the Stockholm Conference (1972) and Bhopal, and covers gaps left by earlier Acts.
The Central Government may set standards for emissions and discharges, restrict industrial locations, and regulate hazardous substances.
It can inspect industries, take samples and issue closure or power-cut directions.
Penalty: imprisonment up to 5 years or fine up to Rs 1 lakh or both, with an extra fine up to Rs 5,000 per day for continued violation, and up to 7 years if it continues beyond one year.
Water Act, 1974: India's first pollution law; sets up the Central and State Pollution Control Boards (CPCB, SPCBs), needs their consent to discharge effluent into streams or wells, and prohibits polluting them.
Air Act, 1981: covers air pollutants including industrial and vehicle emissions (noise added in 1987); declares air pollution control areas, sets emission standards and needs consent to operate.
Both Acts are enforced by the pollution control boards, with penalties of about 18 months to 6 years' imprisonment and fine.
Public awareness means informing people through education, media, NGOs and participation, since laws succeed only if citizens comply, report violations and use the right to information.

Answer frame. Open with the 1986 Act's purpose and background; list its provisions and penalties; add one paragraph each on the Water and Air Acts (board, consent, penalty); for "major Acts and public awareness" also add the Wildlife and Forest Acts and end with public awareness; close on protection needing law plus participation.

Asked: [14 marks] (Nov 2019) Write a brief note on Environmental protection Act. Asked: [7 marks] (Dec 2025) Explain major environmental protection acts in India and public awareness.

Wildlife Protection Act; Forest Conservation Act

Definition. The Wildlife (Protection) Act, 1972 protects wild animals, birds and plants; the Forest (Conservation) Act, 1980 checks deforestation and diversion of forest land.

Key points.

Wildlife Act objectives: protect wildlife, preserve ecological security and stop poaching and illegal trade.
It bans hunting, and creates National Parks, Wildlife Sanctuaries and conservation reserves.
Species are listed in six Schedules: I and II have the highest protection and penalties, III and IV lesser, V is vermin, VI is plants.
It sets up the National Board for Wildlife, State Wildlife Advisory Boards and the Central Zoo Authority.
Forest Act goals: no de-reservation of reserved forest and no use of forest land for non-forest purposes without prior Central Government approval.
It prevents indiscriminate deforestation, preserves forest biodiversity, and makes compensatory afforestation mandatory; penalty is imprisonment up to 15 days.

Answer frame. Open with year and purpose of each Act; develop objectives, features (parks, schedules, boards), then the Forest Act's approval rule and compensatory afforestation; close with their role in conservation.

Asked: [7 marks] (Dec 2023) What are the objectives of Wildlife Protection Act? When was it implemented, and write its features. Asked: [7 marks] (Dec 2023, Dec 2025) What are the main goals of Forest Conservation Act 1980?

Issues involved in enforcement of environmental legislation; Public awareness

Definition. Enforcement issues are the practical hurdles that stop environmental laws from working; public awareness is people's knowledge and participation in protecting the environment.

Key points.

Enforcement is weak because of corruption, shortage of staff and funds, and slow courts.
Industries resist costs, and overlapping agencies cause delays.
Awareness through school education, media, NGOs and campaigns such as Chipko builds compliance and citizen monitoring.

Last-minute revision

Sustainable development: meeting present needs without harming future generations (Brundtland, 1987).
Three pillars: environmental, social, economic.
EIA: a predictive tool that assesses a project's environmental effects before approval.
Watershed: land area draining to a common outlet; India codes it hierarchically (AISLUS).
Acid rain: pH below 5.6, from $SO_2$ and $NO_x$.
Ozone depletion: CFCs release chlorine; Montreal Protocol 1987.
Kyoto 1997; Paris 2015.
Water Act 1974; Air Act 1981; Environment Protection Act 1986.
Wildlife Protection Act 1972 has six Schedules; Forest Conservation Act 1980 needs Central approval.
Nuclear accidents: Three Mile Island 1979, Chernobyl 1986, Fukushima 2011.

Memory hooks

Acts in order 72, 74, 80, 81, 86: Wildlife, Water, Forest, Air, Environment.
ESE for pillars: Environment, Society, Economy.
Bhopal 1984 led to the 1986 Act.
CFC: Chlorine Frees the Cl atom that eats ozone.

Coverage checklist

From Unsustainable to Sustainable development: Q6 goals and significance, Q7 EIA.
Urban problems related to energy: no past questions.
Water conservation, rain water harvesting, watershed management: Q9 watershed; rainwater in Q12.
Resettlement and rehabilitation of people; its problems and concerns: Q8, Q12.
Environmental ethics: Issues and possible solutions: Q5.
Climate change, global warming, acid rain, ozone layer depletion, nuclear accidents and holocaust: Q1, Q3.
Wasteland reclamation; Consumerism and waste products: no past questions.
Environment Protection Act; Air (Prevention and Control of Pollution) Act; Water (Prevention and control of Pollution) Act: Q2, Q4.
Wildlife Protection Act; Forest Conservation Act: Q10, Q11.
Issues involved in enforcement of environmental legislation; Public awareness: no past questions (public awareness in Q4).

Account

Energy & Environmental Engineering (ES-301) - Unit 5 Short Notes

How unit 5 is examined

From Unsustainable to Sustainable development

Urban problems related to energy

Water conservation, rain water harvesting, watershed management

Resettlement and rehabilitation of people; its problems and concerns

Environmental ethics: Issues and possible solutions

Climate change, global warming, acid rain, ozone layer depletion, nuclear accidents and holocaust

Wasteland reclamation; Consumerism and waste products

Environment Protection Act; Air (Prevention and Control of Pollution) Act; Water (Prevention and control of Pollution) Act

Wildlife Protection Act; Forest Conservation Act

Issues involved in enforcement of environmental legislation; Public awareness

Last-minute revision

Memory hooks

Coverage checklist