Non-renewable resources

Also called: Exhaustible resources · Topic: Environment and Sustainable Development · NCERT: Class 10, Ch 1 "Development"; Class 11, Ch 7 "Environment and Sustainable Development"

Meaning

Non-renewable resources (also called exhaustible resources) are resources whose stock is fixed and does not grow back within human time. Each unit we extract and use is gone for good, so the stock keeps shrinking. Fossil fuels such as coal, crude oil and natural gas are the standard examples.

They matter because modern production and transport run on them. Once they are used up, a country must pay more for the same energy, look for new reserves or switch to other sources. A key measure of how long they will last:

R/P life = Known reserves ÷ Current annual production

Explanation

How a non-renewable resource runs out

• Fixed stock: Class 10 NCERT says the stock is fixed.
• New discoveries add to the known stock.

• But the stock will still run out over time, because nature does not put back what we take out.

• Link to the environment's first function: the environment supplies resources, both renewable and non-renewable. Non-renewable resources are the part of this supply that cannot be refilled.

• Resource depletion (the fall in the quantity of a resource): intensive extraction exhausts resources.
• So money must go into exploration and new technology to find more.
• NCERT counts this spending as part of the opportunity cost (the value of the next-best thing you give up) of environmental damage.

Measuring how long they will last: R/P life

• Reserves-to-production (R/P) life: the number of years known reserves will last at today's rate of extraction.
• Crude-oil reserves, 2017 (Class 10, Table 1.7):

Region	Reserves (bn barrels)	Years reserves will last	Implied yearly output
Middle East	836	70	836 ÷ 70 ≈ 12 bn barrels
USA	69	10.5	69 ÷ 10.5 ≈ 6.6 bn barrels
World	1,732	47	1,732 ÷ 47 ≈ 37 bn barrels

• Worked example (world, 2017):
• The world produces about 37 bn barrels a year.

• 1,732 ÷ 37 ≈ 47 years. NCERT rounds this to "only 50 years more".

• Why the USA runs out fast: its reserve is small (69 bn barrels) and it extracts heavily, so its R/P life is only 10.5 years.

• Limits of R/P life:
• It assumes output stays the same. If output rises, the real life is shorter.
• It ignores new discoveries. If new oil is found, the real life is longer.

Pricing over time: the Hotelling rule

• Hotelling rule (Harold Hotelling, 1931): for the best extraction path, the net price of a non-renewable resource should rise at the rate of interest.
• Net price (also called scarcity rent) = market price − extraction cost.

• Formula: (Pₜ₊₁ − Pₜ) / Pₜ = r, where P is the net price and r is the interest rate.

• Intuition:

• Oil left in the ground works like an asset.
• It must "earn" as much as money kept in a bank.

• If it earns less, owners will pull it out faster and bank the money.

• Worked example: net price today = ₹100 per barrel and r = 5%.

• Next year: ₹100 × 1.05 = ₹105.

• The year after: ₹105 × 1.05 ≈ ₹110.25.

• How the market corrects itself:

• Owners expect the net price to rise by less than 5% → they extract more now.
• Supply rises today → today's price falls.

• This continues until the rule holds again.

• Lesson: as a non-renewable resource gets scarcer, its price tends to rise over time.

What speeds up or slows down exhaustion

• Faster exhaustion:
• Rising population in developing countries: more people need resources.
• Affluent consumption and production in developed countries: each person uses far more resources.

• Supply-demand reversal: after the population explosion and the Industrial Revolution, demand for environmental resources went beyond what the environment could supply. This trend continues today.

• Slower exhaustion (a longer real life):

• New discoveries through exploration.
• New technology, and a shift to renewable resources.

In India

• India imports most of its oil (Class 10).
• World oil prices rise → India's import bill rises.

• Fuel and transport become costlier → prices of goods rise for everyone.

• Energy security: the world's R/P life for crude oil was about 47 years in 2017. Hotelling's logic says the net price will keep rising as stocks fall. So an oil-importing country like India faces:

• price shocks from outside

• the need to shift to renewables, use energy more efficiently and keep strategic reserves

• Geopolitics: countries with small reserves, such as the USA, try to secure oil through military or economic power (Class 10). India's supply is exposed to this power politics.

• Heavy spending on exploration: exhausted resources force spending on research, exploration and new technology. NCERT treats this as part of the "high" opportunity cost of environmental damage.
• Contrast with a renewable resource in India: groundwater is renewable, but pumping more than rain puts back makes the water table fall. NITI Aayog's Composite Water Management Index (CWMI, 2018) says about 600 million (60 crore) Indians face high to extreme water stress [3]. So overuse can make even a renewable resource behave like an exhaustible one.

Don't confuse with

• Renewable resources: their supply regenerates (examples: forests, fish). Non-renewable resources have a fixed stock. Trap: renewable does not mean unlimited. Groundwater is renewable but can still be overused (Class 10).
• Resource depletion vs environmental degradation: depletion is about the quantity of resources falling, for example oil running out. Degradation is about the quality of the environment falling, through pollution, deforestation and soil erosion.
• Reserves vs total stock: R/P life uses only known reserves. New discoveries raise reserves, but the total stock in nature is still fixed.
• Carrying capacity: this limit applies to renewable resources and waste: extraction ≤ regeneration and waste ≤ assimilating capacity. A non-renewable resource has no regeneration rate, so any extraction reduces its stock.

Prelims Hooks

• NCERT (Class 10) says the stock of non-renewable resources is fixed. New discoveries add to it, but it will still run out over time. Example: fossil fuels (coal, crude oil, natural gas).
• R/P life = Known reserves ÷ Current annual production. World crude oil in 2017: 1,732 bn barrels, lasting about 47 years. NCERT says "only 50 years more".
• Class 10, Table 1.7 (2017): Middle East 836 bn barrels, lasting 70 years. USA 69 bn barrels, lasting 10.5 years.
• Hotelling rule (1931): the net price (market price − extraction cost) of a non-renewable resource rises at the rate of interest, not at the inflation rate or the growth rate.
• Trap: "Groundwater is a non-renewable resource" is wrong. It is renewable but can be overused.
• R/P life understates the real life if new reserves are found, and overstates it if output rises.

Mains Points

• Intergenerational equity (fairness between present and future generations)
• Every barrel used today is one less for future generations.
• This links directly to the Brundtland definition of sustainable development: "development that meets the needs of the present without compromising the ability of future generations to meet their own needs" (1987) [2].

• Class 10 puts it this way: "We have not inherited the world from our forefathers — we have borrowed it from our children."

• Energy security for an importing economy (GS-III)

• India imports most of its oil. The world's R/P life is limited (about 47 years, 2017), and Hotelling scarcity pushes prices up over time.

• Case for diversifying: renewables, energy efficiency and strategic reserves. This lowers the import bill and protects India from price shocks and oil geopolitics.

• Need vs greed and differentiated responsibility (GS-II/III)

• Two drivers exhaust these resources: population pressure in developing countries and affluent consumption in developed countries.
• This supports differentiated responsibility in global talks.
• Gandhi's line fits here: "The Earth has enough resources to meet the needs of all but not enough to satisfy the greed of even one person."

Related concepts

• Environment
• Biotic and abiotic components
• Functions of the environment
• Renewable resources
• Reserves-to-production life
• Hotelling rule
• Carrying capacity
• Absorptive capacity
• Environmental crisis
• Supply-demand reversal of environmental resources

Read more

• The environment, its functions and the supply-demand reversal