Environment Studies
Unit 7: Human Population and the Environment
Detailed Bilingual Notes (English + Hinglish) • BA • Semester 1
Unit 7 at a Glance
This unit studies people as an environmental factor: how population grows, why it explodes in developing countries, what governments do about it, and how population links to health, women-and-child welfare and values. It is a high-scoring unit — mostly definitions, theories and programme names.
| Topic | Core idea | Must-remember fact |
|---|---|---|
| Population growth | Births − deaths ± migration | World crossed 8 billion (Nov 2022) |
| India's population | World's most populous since April 2023 | ~1.44 billion; growth slowing |
| Population explosion | Death rate falls, birth rate stays high | Malthus, 1798 |
| Demographic transition | 4 stages from high to low vital rates | India in late stage 3 |
| Family welfare | Contraception + maternal/child health | India: world's first programme, 1952 |
| HIV/AIDS | Virus attacks immunity | First reported 1981; NACO 1992 |
| Women & child welfare | ICDS, Beti Bachao Beti Padhao | ICDS 1975; BBBP 2015 |
| Value education | Values for sustainable living | Environmental values in curriculum |
Ye unit insaan ko environment ka factor maan ke padhati hai: aabadi kaise badhti hai, developing deshon me population explosion kyun hota hai, sarkar kya karti hai, aur aabadi ka sehat, mahila-baal kalyan aur values se kya rishta hai. Ye scoring unit hai — definitions, theories aur programme ke naam pakke karo.
1. Population Growth and Variation
Population growth is the change in the number of people in an area over time: Growth = (Births − Deaths) + (In-migration − Out-migration). When expressed as a percentage of total population, it is the growth rate. Doubling time — the years for population to double — is roughly 70 ÷ growth rate.
Global and Indian picture
- World population crossed 8 billion on 15 November 2022 (UN).
- India became the world's most populous country in April 2023 (UNFPA), overtaking China; India's population is about 1.44 billion and still growing, though the growth rate is falling.
- Growth is uneven: sub-Saharan Africa and South Asia grow fast; Europe, Japan and China face ageing and shrinking populations.
Key demographic terms
| Term | Meaning |
|---|---|
| Birth rate / Death rate | Births/deaths per 1,000 people per year |
| Fertility rate (TFR) | Average children per woman; 2.1 is replacement level |
| Infant Mortality Rate (IMR) | Infant deaths per 1,000 live births (health indicator) |
| Sex ratio | Females per 1,000 males (India Census 2011: 943) |
| Population density | People per sq km (India among the world's highest) |
| Age structure | Share of young, working-age and old — decides the dependency ratio |
Population growth = (janm − mrityu) + (aane wale − jaane wale). Doubling time = 70 ÷ growth rate. Duniya 15 Nov 2022 ko 8 arab paar kar gayi; April 2023 me Bharat China se aage nikal ke sabse zyada aabadi wala desh bana (~1.44 arab).
Terms yaad rakho: TFR (2.1 = replacement level), IMR (1000 janmon pe shishu mrityu), sex ratio (2011 me 943), density, age structure.
2. Population Explosion — Causes and Effects
Population explosion is the sudden, rapid rise in population when the death rate falls sharply (better food, sanitation, medicines) while the birth rate stays high — creating a huge gap between births and deaths. India experienced it between roughly 1951 and 1981.
Causes
- Fall in death rate and IMR due to vaccinations, antibiotics, hospitals.
- High birth rate from early marriage, low female literacy, son preference, limited contraceptive use.
- Improved food supply ending famines; religious and social norms favouring large families.
Effects on environment and development
- Resource pressure: more demand for food, water, energy, housing → deforestation, groundwater depletion.
- Unemployment and poverty: jobs grow slower than the workforce.
- Urban crowding: slums, traffic, waste (links back to Unit 6).
- Malthusian warning: Thomas Malthus (Essay on the Principle of Population, 1798) argued population grows geometrically while food grows arithmetically — technology and family planning have so far held off his crisis in India.
Population explosion ka matlab: mrityu-dar tezi se gire (dawai, hospital, safai) lekin janm-dar unchi rahe — beech ka antar aabadi ko uda deta hai. Bharat me 1951–81 ke beech yehi hua. Kaaran: jaldi shaadi, kam mahila saksharta, beta-pasand, garbh-nirodhak ka kam istemal. Asar: khana-paani-bijli pe dabav, berozgari, jhuggiyan, jungle katna. Malthus (1798) ne chetaya tha — aabadi geometric, khana arithmetic badhta hai.
3. Demographic Transition Theory
The demographic transition theory describes how countries move from high birth and death rates to low birth and death rates as they develop, passing through four (sometimes five) stages.
| Stage | Birth rate | Death rate | Growth | Example |
|---|---|---|---|---|
| 1. High stationary | High | High | ~Zero | Pre-industrial societies |
| 2. Early expanding | High | Falls fast | Explodes | India 1951–81 |
| 3. Late expanding | Falls | Low | Slowing | India today |
| 4. Low stationary | Low | Low | ~Zero | Europe, Japan |
| 5. Declining (added later) | Very low | Low (ageing) | Negative | Japan, parts of Europe |
Demographic dividend: when the working-age share is large (India now), the economy can grow fast if there are jobs and skills — a one-time window, not a guarantee.
Demographic transition: desh vikas ke saath 4 stages se guzarta hai — (1) janm-mrityu dono unche, (2) mrityu gire, janm uncha = explosion (Bharat 1951–81), (3) janm bhi gire = dheemi growth (aaj ka Bharat), (4) dono neeche (Europe-Japan). Demographic dividend: jab kaam-kaji umar wale zyada hon — sahi istemal ho to vikas tez, warna berozgari.
4. Family Welfare Programmes in India
- India launched the world's first national family planning programme in 1952.
- Approach shifted from targets/sterilisation drives to the Reproductive and Child Health (RCH) approach — voluntary, informed choice.
- Contraceptive methods: condoms, oral pills, copper-T/IUD, sterilisation (vasectomy, tubectomy), injectables; spacing methods promoted under Mission Parivar Vikas (2016) in high-fertility districts.
- Maternal/child health: Janani Suraksha Yojana (institutional deliveries), Mission Indradhanush (immunisation).
- NFHS (National Family Health Survey) tracks fertility, mortality and nutrition every few years — NFHS-5 showed TFR ≈ 2.0.
1952 me Bharat ne duniya ka pehla national family planning programme shuru kiya. Ab zabardasti nahi — swecchha (voluntary) wala RCH approach hai: nirodh, goli, copper-T, nasbandi; Mission Parivar Vikas (2016) zyada-fertility wale zilon me; maa-bachcha swasthya ke liye Janani Suraksha, Mission Indradhanush; NFHS survey har kuch saal me — TFR ab ~2.0.
5. Environment and Human Health
Environmental health studies how environmental factors — air, water, soil, food, housing and climate — affect human health. The WHO estimates that a large share of the global disease burden is linked to modifiable environmental risks.
Disease groups linked to the environment
| Route | Diseases | Environmental link |
|---|---|---|
| Water-borne | Cholera, typhoid, dysentery, hepatitis (jaundice) | Contaminated drinking water; open defecation |
| Vector-borne | Malaria, dengue, chikungunya | Stagnant water breeds mosquitoes; warming expands mosquito range |
| Air-borne / respiratory | Asthma, bronchitis, TB, lung cancer | PM2.5, indoor chulha smoke, industrial emissions |
| Soil/food chain | Fluorosis, arsenicosis, pesticide poisoning | Excess fluoride (Rajasthan), arsenic (West Bengal, Bihar), pesticide residues |
| Heat-related | Heatstroke, dehydration | Heatwaves intensified by climate change and urban heat islands |
Prevention: safe drinking water (Jal Jeevan Mission), sanitation (Swachh Bharat), vaccination, vector control, clean cooking fuel (Ujjwala), and air-quality action plans.
Environmental health ka matlab: aas-paas ka mahaul sehat pe kya asar dalta hai. Paani se: cholera, typhoid, jaundice. Machchhar se: malaria, dengue (ruka hua paani). Hawa se: asthma, TB (chulhe ka dhuaan, PM2.5). Mitti-khane se: fluorosis (Rajasthan), arsenic (Bengal-Bihar). Garmi se: heatstroke. Bachav: saaf paani, shauchalaya, teeka, saaf chulha (Ujjwala), machchhar-control.
6. HIV/AIDS
HIV (Human Immunodeficiency Virus) attacks the body's immune system (CD4 cells); AIDS (Acquired Immuno-Deficiency Syndrome) is the late stage when immunity collapses and opportunistic infections appear. There is no cure, but ART (antiretroviral therapy) lets people live long, healthy lives.
- First recognised: 1981 (USA); HIV identified in 1983 (Montagnier and Barré-Sinoussi, Nobel Prize 2008).
- Transmission: unprotected sex, infected blood transfusion/needles, mother-to-child (pregnancy/delivery/breastfeeding). NOT spread by touch, hugging, sharing food or mosquito bites.
- Prevention: safe sex (condoms), screened blood, sterile needles, PPTCT for mothers.
- India: NACO (National AIDS Control Organisation) set up in 1992; free ART through government centres; 1 December is World AIDS Day; the red ribbon is the symbol of awareness.
HIV sharir ki raksha-pranali (immunity) pe hamla karta hai; AIDS uska aakhri stage hai. Ilaaj nahi, lekin ART dawai se lambi sehatmand zindagi jee sakte hain. Pehchan 1981 me, virus 1983 me mila. Phailta hai: asurakshit sambandh, sankramit khoon/sui, maa se bachche ko. Nahi phailta: chhoone, gale lagne, khana baantne se. Bharat me NACO (1992), muft ART; 1 December = World AIDS Day; laal ribbon nishan hai.
7. Women and Child Welfare
Women and children are the most vulnerable to environmental and health risks — and educating and empowering women is the strongest lever for population stabilisation.
- ICDS (Integrated Child Development Services), 1975 — anganwadis provide nutrition, immunisation, health check-ups and pre-school education to children under 6 and mothers.
- Beti Bachao Beti Padhao, 2015 (launched 22 January 2015, Panipat) — tackles declining child sex ratio through survival, protection and education of the girl child.
- Maternal health: Janani Suraksha Yojana promotes institutional delivery to cut maternal deaths (MMR — maternal deaths per 1,00,000 live births).
- Why it matters for environment: educated women have fewer, healthier children, adopt family planning, and manage household water, fuel and nutrition more sustainably.
Mahilayein aur bachche sabse zyada vulnerable hain — aur mahila shiksha aabadi-sthirata ka sabse mazboot hathiyar hai. ICDS (1975): anganwadi me poshan, teeka, jaanch, pre-school. Beti Bachao Beti Padhao (2015): betiyon ki suraksha-shiksha. Janani Suraksha: hospital me delivery se maa ki mrityu kam. Padhi-likhi mahila kam bachche, parivar niyojan, aur paani-eendhan ka samajhdar istemal — environment ke liye bhi fayda.
8. Value Education
Value education is education that builds humane values — compassion, honesty, tolerance, respect for nature and responsibility toward society — so that knowledge is used for sustainable and ethical living, not just for exams and jobs.
- Environmental values: respect for all life, frugality (avoiding waste), inter-generational responsibility, harmony with nature — rooted in Indian traditions (sacred groves, tree worship, Bishnoi ethics from Unit 6).
- Social values: gender equality, dignity of labour, secularism, democratic participation.
- In practice: school eco-clubs, cleanliness drives, water-saving habits, saying no to single-use plastic, respecting diversity — small daily acts that scale to national change.
- The Supreme Court has emphasised environmental education; EVS itself became compulsory in schools and colleges partly to build these values.
Value education ka matlab: aise sanskar jo insaan ko insaan banayein — daya, imandari, prakriti ka samman, samaaj ke prati zimmedari — taaki gyaan sirf naukri ke liye nahi, sustainable jeevan ke liye kaam aaye. Environmental values: kam kharch (frugality), aane wali peedhi ka khayal, prakriti se mel. Roz ke chhote kaam — paani bachana, plastic mana karna, safai — yehi value education hai.
9. Quick-Revision Table
| Question stem | Answer |
|---|---|
| Population growth formula | (Births − Deaths) + (In-migration − Out-migration) |
| Doubling time | 70 ÷ growth rate |
| World 8 billion / India most populous | 15 Nov 2022 / April 2023 |
| Replacement-level TFR | 2.1 |
| Population explosion | Death rate falls, birth rate stays high |
| Malthus | 1798 — Essay on Population |
| Demographic transition stages | 4 (India: late stage 3) |
| World's first family planning programme | India, 1952 |
| HIV identified / AIDS first reported | 1983 / 1981 |
| NACO | 1992 |
| World AIDS Day | 1 December |
| ICDS / Beti Bachao Beti Padhao | 1975 / 2015 |
| Value education core | Compassion, honesty, respect for nature, responsibility |