Biodiversity — Environmental Law Notes

Biodiversity

India makes up about 2.4% of the world’s land area but is home to nearly 8% of all recorded species — tigers, elephants, one-horned rhinos, thousands of flowering plants found nowhere else. That richness is not luck; it is biodiversity, and losing it is the one environmental harm that can never be undone. A polluted river can be cleaned; an extinct species is gone forever.

What is biodiversity?

Biodiversity (short for biological diversity) means the variety of all life on earth — the full range of living organisms, the differences among them, and the ecosystems they form. It is easiest to understand at three levels, and naming these three levels is the heart of the short-note answer:

1. Genetic diversity — the variation within a single species. All tigers are tigers, but no two are genetically identical; this variety is what lets a species adapt and survive disease and change. (Think of the many varieties of rice or mango.)
2. Species diversity — the variety of different species in a given area — how many kinds of plants, animals and microbes live in a forest or a pond.
3. Ecosystem diversity — the variety of habitats and ecosystems in a region — forests, wetlands, grasslands, deserts, coral reefs — each supporting its own community of life.

Why its loss matters. Biodiversity is the engine of the ecosystem services from Topic 1 — pollination, clean water, fertile soil, medicines, food. Greater variety also makes ecosystems resilient: a diverse system recovers from shocks that would destroy a uniform one. And unlike most pollution, extinction is irreversible. Its chief threats are habitat destruction, pollution, over-exploitation (poaching, over-fishing), invasive species and climate change.

The legal framework. Globally, the Convention on Biological Diversity (CBD), 1992 (signed at the Rio Earth Summit) commits nations to conserve biodiversity, use it sustainably, and share its benefits fairly. India gave effect to it through the Biological Diversity Act, 2002, which set up the National Biodiversity Authority, State Biodiversity Boards and local Biodiversity Management Committees. India is officially recognised as a “megadiverse” country, with global biodiversity hotspots such as the Western Ghats and the Eastern Himalayas.

Section 2(b), Biological Diversity Act, 2002: “‘biological diversity’ means the variability among living organisms from all sources and the ecosystems and ecological complexes of which they are part and includes diversity within species or between species and of eco-systems.”

In Simple Terms: Biodiversity is the sheer variety of life — different genes, different species, and different habitats. The law protects it because that variety keeps nature working and, once a species is lost, no statute can bring it back.

🧩 WORKED EXAMPLE — spotting the three levels

Facts. A single mangrove forest shelters forty species of fish, several distinct genetic strains of one crab, and grades from open water into salt-marsh and dry scrub.

Rule. Biodiversity operates at three levels — genetic (within a species), species (variety of species) and ecosystem (variety of habitats).

Apply. The distinct crab strains are genetic diversity; the forty fish species are species diversity; the shift from water to marsh to scrub is ecosystem diversity.

Conclusion. One forest displays all three levels at once — which is why draining it destroys far more than “some fish”: it wipes out variety at every level.

flowchart TD
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    ROOT --> A["Genetic diversity<br/>variation within a species"]:::leaf
    ROOT --> B["Species diversity<br/>variety of species in an area"]:::leaf
    ROOT --> C["Ecosystem diversity<br/>variety of habitats"]:::leaf
    ROOT --> L["Protected by:<br/>CBD 1992 · Biological Diversity Act 2002<br/>(National Biodiversity Authority)"]:::leaf
    classDef root fill:#FFF8DC,stroke:#000,stroke-width:1px,color:#000;
    classDef leaf fill:#E6F3FF,stroke:#1E3A8A,color:#000;
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Case Laws

• Centre for Environmental Law, WWF-I vs Union of India (2013) — the Supreme Court, applying an eco-centric approach, directed measures to protect an endangered species (the Asiatic lion), underlining the State’s duty to conserve biodiversity.
• T.N. Godavarman Thirumulpad vs Union of India (2012) — recognised that protecting forests and the species within them is essential to conserving India’s biodiversity.

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