Unit 1: Natural Resources
Table of Contents
Types of Natural Resources
Natural resources are materials or substances occurring in nature which can be exploited for economic gain. They are classified based on their renewability.
1. Renewable Resources
Resources that can be replenished or regenerated naturally over time. If managed sustainably, they can last indefinitely.
- Examples: Solar energy, wind energy, water (hydropower), forests, and fish stocks.
- Note: These can become *non-renewable* if overexploited (e.g., overfishing, deforestation).
2. Non-renewable Resources
Resources that exist in a fixed quantity and cannot be regenerated on a human timescale. They take millions of years to form.
- Examples: Fossil fuels (coal, oil, natural gas), minerals (iron, copper), and nuclear fuel (uranium).
Forest Resources
Forests are a vital renewable resource providing numerous ecological and economic benefits.
- Uses and Importance:
- Ecological: Produce oxygen, act as carbon sinks (storing CO₂), regulate water cycles (prevent floods/droughts), prevent soil erosion, and harbor biodiversity.
- Economic: Provide timber, fuelwood, paper pulp, and non-timber forest products.
- Forest Cover of India: Refers to all land more than one hectare in area with a tree canopy density of more than 10%, irrespective of legal status or species. (Note: You may need to check the latest "India State of Forest Report (ISFR)" for current statistics).
- Non-Timber Forest Products (NTFPs): All biological products from forests other than timber. They are crucial for the livelihoods of forest-dwelling communities.
- Examples: Bamboo, canes, medicinal herbs, resins, gums, fruits, nuts, and honey.
- Shifting Cultivation (Jhum): An agricultural system where a patch of forest is cleared (slashed) and burned. The ash fertilizes the soil for a few years, after which the plot is abandoned and the farmer moves to a new patch, allowing the old one to regenerate. This is sustainable with long fallow periods but becomes a source of deforestation when population pressure shortens the cycle.
- Joint Forest Management (JFM): A policy of partnership between state forest departments and local communities. Communities get the right to share in the benefits (like NTFPs and some timber) in exchange for protecting and managing the forest.
Energy Resources
Energy is a key resource for economic development. It is sourced from various renewable and non-renewable forms.
| Energy Source | Type | Description & Key Issues |
|---|---|---|
| Fossil Fuels | Non-renewable | (Coal, oil, natural gas). Formed from ancient organic matter. Provide most of the world's energy but are the primary cause of air pollution (SO₂, NOx) and global warming (CO₂). |
| Hydroelectric Power | Renewable | Energy generated from flowing water (dams). It is clean (no air pollution) but has large environmental impacts (submergence of land, habitat fragmentation, displacement of people). |
| Wind Energy | Renewable | Uses wind turbines to generate electricity. Clean energy, but has high setup costs, is intermittent (needs wind), and can cause bird mortality. |
| Solar Energy | Renewable | Energy from sunlight (using photovoltaic cells or solar thermal). It is abundant and clean, but is intermittent (needs sun) and requires large land areas for panels. |
| Nuclear Energy | Non-renewable | Uses nuclear fission of Uranium to generate heat and electricity. Produces huge amounts of energy with zero greenhouse gas emissions, but has the major problem of long-term radioactive waste disposal and the risk of catastrophic accidents. |
Mineral Resources
Minerals are naturally occurring inorganic substances with a definite chemical composition and crystalline structure. They are non-renewable.
- Types:
- Metallic Minerals: Provide metals (e.g., Iron ore, Bauxite (for aluminum), Copper).
- Non-Metallic Minerals: Do not provide metals (e.g., Limestone, Mica, Gypsum).
- Distribution of Important Minerals in India:
- Iron Ore: Concentrated in Jharkhand, Odisha, Chhattisgarh (Chota Nagpur Plateau).
- Coal: Also concentrated in Jharkhand, Odisha, West Bengal, Chhattisgarh (Gondwana coalfields).
- Bauxite: Odisha is the largest producer, followed by Jharkhand, Gujarat.
- Manganese: Odisha, Madhya Pradesh, Maharashtra.
Mining for mineral resources is a major cause of environmental degradation, including deforestation, soil erosion, and water pollution.