Class 12 Economics: Environment and Sustainable Development Notes | CBSE 2026-27
Environment and Sustainable Development: Complete Class 12 Notes
The environment is not just a source of resources; it is the very foundation of human existence. In the race for economic growth, we have often ignored the health of our planet. These notes cover the full CBSE Class 12 Economics syllabus, focusing on the environmental crisis, global issues like Ozone depletion, and the path toward sustainable development.
1. Environment: Definition and Functions
Environment: It is defined as the total planetary inheritance and the totality of all resources. It includes Biotic (living: plants, animals, birds) and Abiotic (non-living: air, water, land, rocks) elements.
Four Core Functions of the Environment:
- Supplies Resources: Provides both renewable (forests, fish) and non-renewable (fossil fuels) resources for production.
- Assimilates Waste: The environment has the natural ability to absorb and process the waste generated by production and consumption.
- Sustains Life: Provides essential elements like sun, soil, water, and air.
- Provides Aesthetic Services: Offers scenic beauty (mountains, oceans) that improves the quality of human life.
2. The Environmental Crisis
An environmental crisis occurs when the environment fails to perform its functions because the demand exceeds its Carrying Capacity.
| Key Concept | Detailed Explanation |
|---|---|
| Carrying Capacity | Implies two things: (1) Resource extraction rate should be less than the rate of regeneration. (2) Waste generation should be within the absorptive capacity. |
| Absorptive Capacity | The ability of the environment to absorb degradation without causing permanent damage. |
3. Global Environmental Issues
- Global Warming: A gradual increase in the Earth's average temperature due to greenhouse gas emissions (CO2, methane). Impact: Melting polar ice, rising sea levels, and extreme weather.
- Ozone Depletion: The thinning of the protective ozone layer in the stratosphere caused by Chlorofluorocarbons (CFCs) used in refrigerators and ACs. Result: Increased UV radiation reaching Earth, causing skin cancer and harming aquatic life.
4. State of India's Environment
India faces high population pressure on its natural resources. Major concerns include:
- Land Degradation: Caused by deforestation, overgrazing, and shifting cultivation.
- Air Pollution: High in urban areas due to vehicle emissions and industrial smoke.
- CPCB (est. 1974): The Central Pollution Control Board was set up to address water and air pollution across the country.
5. Sustainable Development
Definition: According to the Brundtland Commission (1987) in the report 'Our Common Future', it is development that "meets the needs of the present without compromising the ability of future generations to meet their own needs."
Key Features:
- Sustained rise in real per capita income.
- Rational use of natural resources.
- Focus on inter-generational equity.
6. Strategies for Sustainable Development
To achieve sustainable growth, India must shift its approach:
- Use of Non-Conventional Energy: Shifting from thermal/hydro power to Solar and Wind energy to reduce CO2 emissions.
- Cleaner Fuels: Promoting LPG and Gobar Gas in rural areas, and CNG in urban public transport.
- Traditional Knowledge: Using ancient, eco-friendly practices (e.g., Ayurveda, traditional farming) which have no side effects.
- Bio-Composting: Using organic waste as fertilizer instead of chemical fertilizers which cause land degradation.
- Bio-Pest Control: Using plant-based pesticides like Neem to protect crops without harming the soil.
- Mini-Hydel Plants: Small turbines in streams to generate electricity for local needs with minimal environmental impact.
Frequently Asked Questions (FAQs)
Q1: What is the "Year of Great Divide" in this context?
A: While usually linked to demographics (1921), in environment, students must focus on the shift in the mid-20th century where resource extraction began to exceed regeneration globally.
Q2: Why is the environment's "Absorptive Capacity" limited?
A: Natural systems can only break down a certain amount of pollutants. Beyond that point, the environment gets saturated, leading to visible pollution and climate change.
Q3: Name two environmental movements in India.
A: The Chipko Movement (Himalayas) and the Appiko Movement (Karnataka) were grassroots efforts to protect forest cover.