Importance of Biodiversity

Biodiversity is not a luxury of nature — it is the very foundation on which human culture and civilisation have been built. The book opens this section with a two-way relationship: biodiversity has contributed enormously to the development of human culture, and in turn, human communities have shaped the diversity of nature at the genetic, species, and ecological levels. So the relationship is mutual, not one-sided.

From here, the section identifies three distinct roles that biodiversity plays: ecological, economic, and scientific. Each role is explained separately, and each carries its own weight of responsibility.

Ecological Role

Every species, no matter how small or seemingly insignificant, performs some function in an ecosystem. Nothing in an ecosystem exists without a purpose. The book gives a concrete example: the grasslands and sholas in the Indira Gandhi National Park in the Annamalai hills of the Western Ghats — an example of ecosystem diversity. In such ecosystems, every species is a thread in a web; remove one, and the whole fabric weakens.

This ecological role is what keeps ecosystems functioning — nutrient cycling, energy flow, pollination, predation, and decomposition all depend on the presence and interaction of many species.

Economic Role

Biodiversity is a direct source of economic value. The book lists several categories of economic benefit:

• Food: Every human society depends on biodiversity for its food supply — crops, livestock, fish, and wild edibles.
• Fuel: Wood and other biomass from natural systems provide fuel for cooking and heating, especially in rural and traditional communities.
• Fibre: Cotton, jute, wool, silk, and other fibres come directly from biodiversity.
• Construction material: Timber, bamboo, and thatch are all drawn from biodiversity.
• Industrial products: Many industries depend on biological resources — from paper and rubber to dyes and resins.
• Medicinal products: A vast number of medicines, both traditional and modern, are derived from plants, animals, and microorganisms.

Beyond these direct uses, biodiversity also has indirect economic value — through ecosystem services like soil formation, water purification, and climate regulation, which underpin all economic activity.

Scientific Role

Biodiversity is a treasure house of scientific knowledge. Every species is a unique store of genetic information, and this genetic diversity is of immense scientific importance. The book stresses that each species is a unique genetic resource — one that may hold answers to problems we have not yet even formulated.

The scientific role is not just academic. It has practical consequences: understanding biodiversity helps us develop new medicines, improve crop varieties, and understand how ecosystems respond to change.

The Ethical Dimension

The section then turns to a deeper, moral argument. We are part of the ecosystems of which we are also a species. This fact must be drawn upon by every one of us, so that we live and let other species also live their lives. The book is explicit: it is our ethical responsibility to consider that each and every species, along with us, has an intrinsic right to exist. …