पर्यावरण एवं सतत विकास (Environment & Sustainable Development)

The Environment encompasses the sum total of all surrounding external conditions—both biotic (living organisms like plants, animals, birds) and abiotic (non-living elements like air, water, land, rocks, sunlight):

The 4 Essential Functions of Environment:

1. 1. Supplies Resources for Production: Provides renewable resources (trees, fish, water) and non-renewable resources (fossil fuels, iron ore, bauxite) that form the raw material base for all industries.
2. 2. Assimilates Waste: The natural biosphere acts as a giant sink, absorbing, degrading, and neutralizing byproducts and toxic effluents generated by production and consumption.
3. 3. Sustains Life: Provides essential life-support systems (oxygen, genetic biodiversity, climate stability, hydrological water cycles).
4. 4. Provides Aesthetic Services: Offers scenic beauty, recreational landscapes, and spiritual well-being (mountains, oceans, pristine forests).

Carrying Capacity & Absorptive Capacity:

• Absorptive Capacity: The maximum rate at which the natural environment can absorb, degrade, and neutralize economic waste without suffering permanent ecological degradation.
• Carrying Capacity: The environmental threshold implying two conditions:
  • (i) Resource extraction rate $\le$ Resource regeneration rate.
  • (ii) Waste generation rate $\le$ Absorptive capacity of the environment.
• The Environmental Crisis: Occurs when human economic activity breaches the carrying capacity. When waste output exceeds absorptive capacity, toxic pollutants accumulate, triggering global warming, ozone depletion, and ecosystem collapse.

A. Land Degradation in India:

Nearly 50% of India's total landmass suffers from severe land degradation, soil erosion, and desertification. Major drivers include:

• 1. Loss of vegetation due to massive deforestation.
• 2. Unsustainable fuel-wood extraction and unmanaged overgrazing by livestock.
• 3. Indiscriminate over-use of chemical fertilizers and chemical pesticides, destroying soil micronutrients.
• 4. Faulty irrigation techniques causing soil salinity and water-logging.

B. Air and Water Pollution & Regulatory Institutions:

• CPCB (Central Pollution Control Board): Established in 1974 under the Water (Prevention and Control of Pollution) Act, later entrusted with enforcing air quality standards under the Air Act of 1981.
• Grassroots Environmental Resistance:
  • Chipko Movement (1970s, Uttarakhand Himalayas): Led by Sunderlal Bahuguna and Chandi Prasad Bhatt; villagers hugged trees to prevent commercial logging.
  • Appiko Movement (1983, Western Ghats, Karnataka): Southern variant of Chipko ("Appiko" means embrace in Kannada) to protect natural rainforests.

The Brundtland Commission Definition (1987):

The UN World Commission on Environment and Development (headed by Gro Harlem Brundtland), in its landmark report Our Common Future (1987), defined Sustainable Development as:

"Development that meets the needs of the present generation without compromising the ability of future generations to meet their own needs."

Core principle: Inter-Generational Equity—the present generation must pass on to future generations an intact stock of natural, environmental, and physical capital no less than what they inherited.

Herman Daly's Rules for Sustainable Development:

• 1. The rate of harvesting renewable natural resources must not exceed their natural rate of biological regeneration.
• 2. The rate of waste generation must be kept below the absorptive assimilative capacity of the environment.
• 3. The rate of depletion of non-renewable resources (e.g., fossil fuels) must not exceed the rate of creation of renewable substitutes (e.g., solar, wind, green hydrogen).
• 4. Technological progress should be oriented toward input-saving and resource-efficiency rather than throughput expansion.

To transition toward ecological sustainability, India is actively adopting clean technology strategies:

• 1. Solar Energy (International Solar Alliance): India's geographic position on the Tropic of Cancer provides 300 sunny days annually. Solar photovoltaic parks (Bhadla, Rewa) generate clean power with zero emissions.
• 2. Wind Power & Mini-Hydel Plants: Harnessing wind kinetic energy across Tamil Nadu and Gujarat coasts; installing mini-hydel run-of-the-river turbines in Himalayan streams without submerging vast forests with mega-dams.
• 3. Use of Cleaner Household Fuels (LPG & Gobar Gas): Replacing dung-cakes and firewood with subsidized LPG (PM Ujjwala Yojana) and biogas plants, eliminating indoor air pollution and eye/lung diseases among rural women.
• 4. CNG in Urban Public Transport: Mandating Compressed Natural Gas (CNG) for buses, auto-rickshaws, and taxis in metro cities drastically cut toxic particulate matter ($PM_{2.5}$ and $PM_{10}$).
• 5. Bio-Pest Control & Organic Farming: Utilizing natural predators (birds, dragonflies, ladybugs) and neem-based bio-pesticides instead of cancer-causing synthetic chemical sprays.
• 6. Traditional Ecological Knowledge: Re-integrating ancient AYUSH herbal healthcare systems (Ayurveda, Unani, Siddha) that work in harmony with nature.