Limits to growth: problems of indiscriminate use and how we measure overuse

Detail

1. Why overuse is a problem: resources treated as "free gifts"

• Free gift of nature: many people think resources are given by nature, cost nothing and will never run out. Because of this belief, people have used them indiscriminately (without care or limit).
• Class 10 NCERT lists three main problems that follow:

Problem	What happens	Example of the result
1. Depletion for the greed of a few	Resources are used up to meet the wants of a small, rich group, not the needs of all	Forests cut and minerals dug out faster than they can be replaced
2. Accumulation in a few hands	A few people or countries own most resources	Society splits into haves (rich) and have-nots (poor)
3. Global ecological crises	Overuse damages the whole Earth system	Global warming, ozone layer depletion, environmental pollution, land degradation

• The NCERT conclusion:
• Resources must be shared fairly (equitable distribution). This is needed for a lasting good quality of life and for peace in the world.
• So resource planning is needed for sustainable existence. Sustainable existence means living in a way that meets today's needs and leaves enough for future generations.
• Sustainable existence is a part of sustainable development.

2. The 1960s–70s alarm: early warnings about limits

a) The Population Bomb (1968)

• Written by Paul Ehrlich, a biologist in the USA, in 1968.
• Its warning was that population was growing faster than food supply, so there would be mass famine (widespread hunger and deaths) in the 1970s–80s.
• It made "overpopulation" a global worry. It also fed the debate on carrying capacity: the largest population that an area's resources can support without being damaged.

b) The Club of Rome (1968)

• Club of Rome: a think tank (a group of experts who study problems and suggest policy). It was founded in April 1968 in Rome, Italy.
• Founders: Aurelio Peccei (an Italian industrialist) and Alexander King (a Scottish scientist) [3].
• Class 10 NCERT: the Club of Rome was the first to argue for resource conservation in a systematic way (in 1968).

c) The Limits to Growth (1972)

• The Club of Rome commissioned this report (asked for it and paid for it). It was published in 1972 [3].
• Authors: a team at MIT (Massachusetts Institute of Technology, USA): Donella Meadows, Dennis Meadows, Jørgen Randers and William Behrens III [3].
• Method: the team built a computer model of the world economy called World3. It used system dynamics, a method created by Jay Forrester at MIT that tracks how many linked factors affect each other over time [3].
• How the model works (cause → process → result):
• Population, industry, food output, resource use and pollution are all linked.
• Each of them grows exponentially, which means it doubles again and again (like 1, 2, 4, 8, 16).
• Land, minerals and the Earth's ability to absorb pollution are finite (fixed in amount).

• So growth hits these limits suddenly, and food, industry and population then fall sharply ("overshoot and collapse").

• Scenarios: the model was run under 12 scenarios [3].

• In 1972, the world economy was still inside the planet's limits, with room to grow.

• But if growth continued, the "standard run" showed a sudden collapse of world population sometime in the 21st century [3].

• Main warning: unchecked growth in population, industry and resource use would hit the planet's limits within about 100 years.

• Why it mattered: it challenged the common belief that modernisation and industrialisation alone would bring progress for all humanity [3].

d) Critiques and later checks

• The Green Revolution: from the mid-1960s, high-yielding varieties (HYV) of wheat and rice, fertilisers and irrigation raised food output sharply in India (Punjab, Haryana, western Uttar Pradesh) and in other parts of Asia and Latin America. The mass famines that Ehrlich and others feared did not happen, so critics say the famine forecasts were proved wrong.
• Ignoring technology and prices: critics say the models did not include:
• new technology (more efficient machines, substitute materials, recycling);

• the price mechanism: when a resource becomes scarce its price rises, so people use less of it and look for substitutes.

• Updates: the authors released Limits to Growth: The 30-Year Update in 2004. Later studies compared real-world data with the 1972 scenarios. A 2018 Nature commentary argued that the "gloomy 1970s predictions about Earth's fate still hold true" [5]. The debate is still open.

• The UN marked the report's 50th anniversary (2022) with a symposium [3].

3. Modern ways to measure overuse

These are newer tools that go beyond the NCERT textbooks. Each measures, in a different way, how far human demand has gone beyond what the Earth can supply.

a) Ecological footprint

• Definition: the area of biologically productive land and water needed to:
• supply everything a person, country or the world uses (food, timber, fibre, space for buildings);

• absorb the waste it produces, especially the carbon dioxide (CO₂) from burning fossil fuels.

• Unit: global hectares (gha). One global hectare is one hectare of land or water with the world's average productivity.

• Origin: developed by Mathis Wackernagel and William Rees in the 1990s (their book came out in 1996) [4]. It is now calculated every year by the Global Footprint Network, using UN data [2][4].
• The opposite measure: biocapacity is the area that is actually available to produce resources and absorb waste. When the footprint is larger than the biocapacity, the result is an ecological deficit, or overshoot.
• The world today: humanity uses the resources of about 1.75 Earths a year (2025), often rounded to 1.7 [2].
• History: humanity was roughly within the Earth's limits around 1971. Overshoot has continued ever since [2].
• India: India's footprint per person is low (well below the world average), but because India has a very large population, its total footprint is large. India's biocapacity per person is also low, so India runs an ecological deficit.

b) Earth Overshoot Day

• Definition: the date each year when humanity's demand on nature goes beyond what the Earth can regenerate (renew) in that whole year. For the rest of the year, we are "borrowing" from the future by:
• cutting more trees than grow back;
• catching more fish than are born;

• adding more CO₂ to the air than forests and oceans can absorb.

• How it is calculated: (Earth's biocapacity ÷ humanity's ecological footprint) × 365 = Earth Overshoot Day. It is calculated by the Global Footprint Network [4].

• Recent dates:

Year	Earth Overshoot Day	Note
1971	about end-December	Humanity roughly within the Earth's limits [2]
2020	22 August	Later than usual because COVID-19 lockdowns briefly cut demand [4]
2025	24 July	About 1.75 Earths in use [2]

• The trap: an earlier date means worse overshoot, not better.

c) Planetary boundaries

• Definition: nine limits for the Earth system, set by Johan Rockström and others at the Stockholm Resilience Centre (Sweden) in 2009. Inside these limits humanity can develop safely. This safe zone is called the "safe operating space". Crossing a limit raises the risk of large, sudden and sometimes irreversible (permanent) change.
• The nine boundaries:

#	Boundary	What it tracks (simple)	Status, 2025 Planetary Health Check
1	Climate change	CO₂ in the air; extra heat trapped	Crossed
2	Biosphere integrity	Loss of species and genetic diversity	Crossed
3	Land-system change	Forest cleared for farms and cities	Crossed
4	Freshwater change	Changes in rivers (blue water) and in soil moisture (green water)	Crossed
5	Biogeochemical flows	Too much nitrogen (N) and phosphorus (P) from fertilisers running off into water	Crossed
6	Novel entities	New human-made substances such as plastics, pesticides and synthetic chemicals	Crossed
7	Ocean acidification	The sea becomes more acidic as it absorbs CO₂, which harms corals and shellfish	Crossed (newly added in 2025)
8	Atmospheric aerosol loading	Fine particles (dust, soot, sulphates) in the air	Not crossed
9	Stratospheric ozone depletion	Thinning of the ozone layer, which blocks the Sun's UV rays	Not crossed

• Trend: 6 of 9 were crossed in the 2023 assessment, and 7 of 9 in the 2025 Planetary Health Check (by the Stockholm Resilience Centre and PIK, the Potsdam Institute for Climate Impact Research, Germany). Ocean acidification was the new boundary crossed.
• Ozone, a success story: the ozone layer is in the safe zone mainly because the Montreal Protocol (1987) phased out CFCs (chlorofluorocarbons: gases once used in fridges and sprays that destroy ozone). It shows that global action can pull a boundary back.
• Link to climate change: rising CO₂ affects three boundaries at once:
• climate change (it traps heat);
• ocean acidification (the sea absorbs CO₂, which forms carbonic acid);
• biosphere integrity (warming and acidic seas bleach coral reefs and push species out of their ranges).

4. From alarm to policy: the timeline

Year	Event	Key idea
1968	The Population Bomb; Club of Rome founded	Warnings about population and resources
1972	The Limits to Growth; UN Conference on the Human Environment, Stockholm	Limits exist; birth of global environmental policy (UNEP set up in 1972)
1987	Brundtland Report, Our Common Future	Sustainable development: development that meets the needs of the present without harming the ability of future generations to meet their own needs
1992	Rio Earth Summit (Rio de Janeiro, Brazil), Agenda 21	Global action plan for sustainable development; fair sharing of resources and local action
2015	Sustainable Development Goals (SDGs), 17 goals for 2030	SDG 12 (responsible consumption and production) directly targets overuse

Prelims Hooks

• Club of Rome: founded in 1968 by Aurelio Peccei and Alexander King. Class 10 NCERT credits it with first arguing for resource conservation in a systematic way.
• The Limits to Growth (1972): MIT team (Donella and Dennis Meadows, Jørgen Randers, William Behrens III) using the World3 model, which is based on Forrester's system dynamics. Do not confuse it with The Population Bomb (Paul Ehrlich, 1968).
• The three NCERT problems of indiscriminate use: depletion for the greed of a few; accumulation in a few hands (haves and have-nots); global ecological crises (global warming, ozone depletion, pollution, land degradation).
• Ecological footprint: unit is the global hectare. Developed by Wackernagel and Rees in the 1990s and calculated by the Global Footprint Network, not by UNEP or the IPCC.
• Earth Overshoot Day 2025 = 24 July. Humanity uses about 1.75 Earths. An earlier date means worse overshoot.
• Planetary boundaries: 9 boundaries, from Rockström et al., 2009, at the Stockholm Resilience Centre.
• 2025 Planetary Health Check: 7 of 9 crossed, with ocean acidification newly added. The two still safe are atmospheric aerosols and stratospheric ozone.
• Trap: "biogeochemical flows" means nitrogen and phosphorus cycles, not the carbon cycle (carbon comes under climate change).
• Order of events: Population Bomb and Club of Rome (1968) → Limits to Growth and Stockholm Conference (1972) → Brundtland Report (1987) → Rio Earth Summit and Agenda 21 (1992) → SDGs (2015).

Mains Points

• Overuse causes inequality as well as ecological damage (GS-I/GS-III):
• When resources pile up in a few hands, the poor bear the cost: tribal people lose forests, small farmers lose groundwater, and coastal fishers lose their fish catch.

• This links fair sharing of resources to peace and a decent quality of life, as NCERT argues.

• Limits to Growth was right about the problem but wrong about the timing:

• Technology (the Green Revolution) and prices pushed back the food limit.
• But the limits have shifted to the sinks, the parts of nature that absorb waste (the atmosphere, oceans and soils).

• The evidence: 7 of 9 planetary boundaries crossed (2025) and an overshoot of 1.75 Earths.

• India's position:

• Its per-capita footprint is low, which supports the CBDR principle (Common But Differentiated Responsibilities) and India's call for climate justice.
• Its total footprint is high and biocapacity is low (groundwater depletion, land degradation, air pollution).

• So India needs resource planning (NCERT), LiFE (Lifestyle for Environment), a circular economy and SDG 12.

• Metrics guide policy:

• The ecological footprint, Overshoot Day and planetary boundaries turn "sustainability" into numbers that can be measured.
• Each has limits: the footprint ignores the loss of species diversity, and the planetary boundaries cannot easily be scaled down to a country. They should be used alongside GDP, not in place of it.