Learning objectives
- Define sustainable development using the standard, widely accepted definition
- Identify and explain the three pillars of sustainable development: economic, social, environmental
- Use key vocabulary related to sustainability accurately: sustainability, renewable, conservation, ecosystem, carbon footprint, resources
- Describe concrete examples of sustainable practices: renewable energy, recycling, conservation, responsible consumption
- Explain why sustainable development requires balancing all three pillars, not just one
- Discuss the causes and consequences of environmental problems using appropriate vocabulary
- Give a structured, well-supported opinion on a sustainability issue
Grammar & vocabulary
Defining sustainable development
The standard, widely used definition comes from the 1987 Brundtland Report: sustainable development is "development that meets the needs of the present without compromising the ability of future generations to meet their own needs." In simpler terms, it means improving people's lives today — economically and socially — without using up or destroying the resources that future generations will need.
The three pillars
Sustainable development rests on three interconnected pillars. The economic pillar concerns fair and lasting growth — creating jobs, supporting responsible businesses, and reducing poverty. The social pillar concerns equity and quality of life — access to education, healthcare, and fair working conditions for everyone. The environmental pillar concerns protecting natural resources and ecosystems — reducing pollution, conserving biodiversity, and slowing climate change. "Real sustainability requires balancing the economic, social, and environmental pillars together — focusing on only one of them is not enough."
Key vocabulary
sustainability = the ability to be maintained at a certain level without depleting resources: "Companies are under pressure to improve the sustainability of their operations." renewable = able to be naturally replenished and therefore not depleted by use, such as solar or wind energy: "Morocco has invested heavily in renewable energy, especially solar power." conservation = the protection and careful management of natural resources: "Conservation programs help protect endangered species." ecosystem = a community of living organisms interacting with their physical environment: "Coral reefs are fragile ecosystems threatened by rising ocean temperatures." carbon footprint = the total amount of greenhouse gases produced directly or indirectly by a person, activity, or organization: "Taking the bus instead of driving reduces your carbon footprint." resources = materials or supplies (natural or economic) that can be used to meet needs: "Water is a precious resource that must be used responsibly."
Examples of sustainable practices
Common examples that appear frequently in Bac texts and essays include: switching to renewable energy sources like solar and wind power instead of fossil fuels; recycling paper, plastic, and glass instead of sending them to landfill; practicing conservation of water and forests through responsible management; and choosing responsible consumption — buying only what is needed, avoiding waste, and favoring durable, eco-friendly products over disposable ones.
Common mistakes
Confusing 'sustainable' with simply 'environmental' — sustainable development is not only about protecting nature; it also includes economic and social dimensions, such as fair wages and access to education.
Using 'renewable' and 'sustainable' as if they mean exactly the same thing — 'renewable' describes a resource that naturally replenishes itself (like solar or wind energy), while 'sustainable' more broadly describes practices that can continue long-term without depleting resources or harming future generations.
Writing 'ecosystem' when 'environment' is meant, or vice versa — an ecosystem is a specific community of living organisms interacting with their physical surroundings (a forest ecosystem, a coral reef ecosystem), while 'environment' is the broader, general natural world around us.
Forgetting the article or using the wrong preposition with 'carbon footprint' — the correct phrase is 'to reduce your carbon footprint' or 'to have a large/small carbon footprint,' not 'to reduce the carbon' alone.
Treating 'conservation' and 'preservation' as identical — conservation generally means the sustainable, managed use of natural resources, while preservation means protecting nature by leaving it untouched; in most Bac contexts, 'conservation' is the more commonly expected term.
Worked example — A school project on sustainability
Passage
"For our sustainable development project, our class studied the three pillars of sustainability. We visited a local farm that uses renewable energy — solar panels power the irrigation system, which lowers both costs and the farm's carbon footprint. We also learned about the conservation efforts protecting the nearby wetland ecosystem, home to several rare bird species. Finally, we interviewed shop owners about responsible consumption, and many said customers increasingly ask for products with less plastic packaging. The project taught us that sustainable development is not just about protecting the environment — it also depends on economic choices, like the farm saving money on energy, and social ones, like fair prices for local workers."
Explanation
The passage touches all three pillars: the environmental pillar appears through "renewable energy," "carbon footprint," "conservation," and "ecosystem"; the economic pillar appears through the farm "saving money on energy"; and the social pillar appears through "fair prices for local workers." The final sentence explicitly makes the point that is most often tested: sustainability requires balancing all three pillars together, not focusing on the environment alone.
3 practice exercises
Exercise 1
EasyMatch each word to its correct definition. Words: 1) sustainability 2) renewable 3) conservation 4) carbon footprint. Definitions: a) the total amount of greenhouse gases produced by a person or activity b) the ability to be maintained at a certain level without depleting resources c) the protection and careful management of natural resources d) able to be naturally replenished, such as solar or wind energy.
Show answer
1-b (sustainability = the ability to be maintained without depleting resources), 2-d (renewable = naturally replenished, like solar or wind energy), 3-c (conservation = protection and careful management of resources), 4-a (carbon footprint = total greenhouse gases produced by a person or activity).
Exercise 2
MediumFill in each blank with the correct word from this list: ecosystem, resources, renewable, responsible consumption. 1) Solar and wind power are examples of ___ energy because they never run out. 2) A coral reef is a fragile ___ that supports thousands of species. 3) Natural ___ such as water and forests must be managed carefully so they last for future generations. 4) Buying only what you need and avoiding waste is an example of ___.
Show answer
1) renewable 2) ecosystem 3) resources 4) responsible consumption.
Exercise 3
HardFor each situation, name which pillar of sustainable development (economic, social, or environmental) it mainly represents, and explain why in one sentence. 1) A factory switches to solar panels to cut its electricity costs and reduce pollution. 2) A government builds new schools in rural areas to give every child access to education. 3) A company plants trees every year to offset the carbon emissions from its factories.
Show answer
1) Mainly economic and environmental — the factory reduces costs (economic) while cutting pollution (environmental), showing how pillars often overlap. 2) Social — building schools improves equity and quality of life for the community, regardless of income. 3) Environmental — planting trees to offset carbon emissions directly protects ecosystems and reduces the company's carbon footprint.
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FAQ
What is the standard definition of sustainable development?
The most widely used definition, from the 1987 Brundtland Report, describes sustainable development as "development that meets the needs of the present without compromising the ability of future generations to meet their own needs." In other words, it means growing and improving living standards today without using up or damaging the resources that future generations will depend on.
What are the three pillars of sustainable development?
The three pillars are economic (fair and lasting growth, jobs, responsible production), social (equity, education, health, quality of life for everyone), and environmental (protecting ecosystems, natural resources, and biodiversity). True sustainability requires balancing all three together, not focusing on just one.
What is a 'carbon footprint'?
A carbon footprint is the total amount of greenhouse gases, mainly carbon dioxide, produced directly or indirectly by a person, an organization, an event, or a product. People reduce their carbon footprint through actions such as using renewable energy, driving less, and choosing responsible consumption.