**Environment** is defined as the **total planetary inheritance** and **totality of all resources**. It includes all **biotic** (living) and **abiotic** (non-living) factors that influence each other and maintain ecological balance.
The environment is a complex, interconnected system where living and non-living components interact continuously to sustain life on Earth.
The environment performs **four critical functions** essential for human survival and economic activity:
The environment supplies both **renewable** and **non-renewable resources**:
The environment absorbs and processes waste generated by human activities and natural processes. It breaks down pollutants through natural processes like decomposition, dilution, and transformation.
The environment sustains all life forms by providing **genetic and biodiversity**. Different species maintain ecological balance, food chains, and genetic resources essential for agriculture, medicine, and biotechnology.
The environment provides scenic beauty, recreational opportunities, and cultural value. Natural landscapes, water bodies, and forests contribute to human well-being and quality of life.
**Carrying capacity** refers to the **maximum load the environment can sustain** without degradation. It depends on:
**Environmental equilibrium exists when**:
**When carrying capacity is exceeded** (current global situation):
**Example**: India extracts 15 million cubic metres of forest annually against permissible limit, causing deforestation and soil erosion of 5.3 billion tonnes yearly.
The reversal of supply-demand relationship for environmental quality creates **opportunity costs**:
These create additional financial burden on governments:
**Global Warming** (Box 7.1):
**Ozone Depletion** (Box 7.2):
**Pre-industrial period**:
**Post-industrial revolution (current era)**:
The transition from **abundant supply of environmental resources to limited supply with high demand** is the fundamental cause of environmental crisis.
India possesses **abundant natural resources** forming foundation for economic development:
India faces **two contrasting environmental threats simultaneously**:
**Five priority environmental concerns identified by Government of India**:
**Factors causing land degradation**:
**Statistical severity**:
**Why India is particularly vulnerable**:
**Characteristics**:
**Vehicle statistics**:
**Industrial air pollution**:
**Health impact**: Respiratory diseases, reduced lung capacity, asthma, bronchitis
**Central Pollution Control Board (CPCB)** established in **1974** as national authority:
**Functions of CPCB and State Boards**:
**Effectiveness limitations**:
**Chipko Movement** (Himalayas) and **Appiko Movement** (Karnataka, meaning "to hug"):
**Context**: Indiscriminate commercial felling of forests by contractors damaged natural forests and caused environmental degradation
**Problems from forest depletion**:
**Appiko action (8 September 1983, Salkani forest, Sirsi district)**:
**Demands for sustainable forestry**:
**Significance**: Demonstrates community-led environmental protection and prioritization of livelihood security over industrial expansion
**Understanding supply chain and environmental impact**:
Example — Truck production:
Example — Book production:
Example — Cloth production:
Example — Petrol/fuel:
**Key insight**: Every economic product has environmental roots; economic development comes at environmental cost
**Question type: Why was truck driver penalised Rs. 10,000 for black soot emissions?**
**Answer**:
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While the chapter notes conclude with these environmental challenges, **sustainable development** emerges as the necessity to balance:
The environmental crisis described above necessitates adoption of sustainable development path where economic activities remain within the **carrying capacity** of the environment while meeting present and future generations' needs.
Q1. Which of the following is NOT a function of the environment?
Answer: C — Environment performs four functions: resource supply, waste assimilation, life sustenance, and aesthetic services; regulation of economic policies is a governmental function, not environmental.
Q2. What is meant by 'carrying capacity' of the environment?
Answer: B — Carrying capacity means the environment can sustain itself when extraction does not exceed regeneration and waste remains absorbable without ecosystem damage.
Q3. Distinguish between renewable and non-renewable resources. Which statement is correct?
Answer: C — Renewable resources like forests regenerate naturally and provide continuous supply; non-renewable resources like fossil fuels are finite and deplete with extraction and use.
Q4. According to the chapter, why has water become an economic commodity in India?
Answer: C — Intensive extraction and pollution have degraded water sources, making freshwater scarce and forcing governments to spend on technology for extraction and treatment.
Q5. If atmospheric CO₂ concentration has increased by 31% since 1750 and CH₄ by 149%, what is the combined percentage increase in these two greenhouse gases?
Answer: C — Percentage increases cannot be simply added without knowing the original quantities of CO₂ and CH₄; a weighted average would be needed for combined effect calculation.
Q6. Which of the following best explains why environmental problems were not significant before industrialisation?
Answer: B — With low pre-industrial population and limited resource demand, the environment's absorptive capacity was sufficient to naturally break down wastes without accumulation.
Q7. Statement 1: Global warming is caused entirely by natural cycles of the earth. Statement 2: Increased greenhouse gases from burning fossil fuels contribute significantly to global warming. Which is correct?
Answer: C — The chapter states that 'much of recent global warming is human-induced' through burning fossil fuels and deforestation; Statement 2 alone is correct.
Q8. The chapter mentions that 70% of water in India is polluted. This statistic indicates which environmental problem?
Answer: A — High pollution levels (70%) make water scarce and valuable, forcing governments to spend significantly on technology, treatment, and research to provide clean water.
Q9. Which statement best reflects the relationship between past economic development and environmental degradation in India?
Answer: C — The chapter explicitly states that 'economic development achieved has come at very heavy price — at cost of environmental quality' with resource depletion and pollution.
Q10. HOTS: If the environment's absorptive capacity is exceeded and its carrying capacity is breached, which TWO functions of the environment are most immediately threatened?
Answer: B — When absorptive capacity is exceeded, waste cannot be properly broken down (assimilation fails) and the environment loses capacity to support life (life sustenance fails); these are most directly threatened.
What is the environment according to economic definition?
Environment is the total planetary inheritance including all biotic (living: plants, animals, forests) and abiotic (non-living: air, water, land, rocks) elements that interact with each other.
Define carrying capacity in environmental economics.
Carrying capacity means the maximum level at which resource extraction does not exceed regeneration rate and wastes remain within the environment's absorptive capacity.
What is absorptive capacity?
Absorptive capacity is the environment's ability to absorb degradation and naturally break down wastes without losing its life-sustaining functions.
Distinguish renewable from non-renewable resources with one example each.
Renewable resources can be used continuously without depletion (example: forest trees); non-renewable resources get exhausted with extraction (example: fossil fuels).
Why has water become an economic commodity in India?
Water became an economic commodity because past intensive development polluted and dried up rivers and aquifers, making it scarce and requiring technology for extraction.
What is global warming and its main human cause?
Global warming is gradual increase in earth's lower atmosphere temperature caused mainly by burning fossil fuels and deforestation, which increase greenhouse gases like CO₂ and methane.
List four vital functions the environment performs.
Environment supplies resources, assimilates waste, sustains life through biodiversity, and provides aesthetic services like scenery.
What percentage of water in India is polluted?
Seventy per cent (70%) of water in India is polluted, leading to increased water-borne diseases and higher health expenditure.
What does the Kyoto Protocol (1997) aim to achieve?
The Kyoto Protocol is an international agreement calling for reductions in greenhouse gas emissions by industrialised nations to combat global warming.
Why were environmental problems not significant before industrialisation?
Before industrialisation, population was low and demand for environmental resources was much less than supply, so pollution remained within the environment's absorptive capacity.
Define environment and list any two of its four vital functions. (2 marks) [2 marks]
Define environment as total planetary inheritance with biotic and abiotic elements. Then state two functions from: resource supply, waste assimilation, life sustenance, or aesthetic services — provide one sentence per function.
Explain why water has become an economic commodity in India. What does this indicate about the state of India's environment? (5 marks) [5 marks]
First explain: past intensive extraction + pollution degraded rivers/aquifers → water scarcity. Second, connect to carrying capacity concept: extraction rate exceeded regeneration rate. Third, show consequences: high technology costs for extraction/treatment, increased health expenditure from water-borne diseases, government financial burden. Use the 70% pollution statistic in your answer.
Analyse the relationship between exceeding environmental carrying capacity and the emergence of environmental crisis in India. How does this concept justify the need for sustainable development? (6 marks) [6 marks]
Carrying capacity definition: extraction rate ≤ regeneration + waste ≤ absorptive capacity. Show when breached: resources deplete, waste accumulates, life-sustaining function fails → crisis. Use specific Indian examples (70% water pollution, air quality, species extinction). Connect to sustainable development: must align growth within carrying capacity, conserve non-renewable resources, protect renewable resource regeneration. Conclude: past unsustainable path requires conscious shift to balance economic goals with environmental limits.
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