APES 5.9-5.10: Introduction to Sustainability

Sustainability

The ability of an environment, economy, or society to continue functioning over a long period of time without exhausting the conditions and resources needed for the future.

Why is sustainability considered a normative concept?

It depends partly on human values and judgments about what conditions are desirable for the future, not solely on scientific measurements.

How does sustainable development differ from sustainability?

Sustainability is generally a long-term goal, whereas sustainable development refers to the policies, processes, and pathways used to pursue that goal.

What principle is expressed by the Brundtland definition of sustainable development?

Development should meet the needs of the present without reducing the ability of future generations to meet their own needs. This emphasizes intergenerational equity.

Intergenerational equity

The ethical principle that present actions should not unfairly reduce future generations' opportunities to obtain resources, welfare, or a healthy environment.

What are the three commonly recognized dimensions of sustainability?

Environmental sustainability, economic sustainability, and social sustainability. They are also called the three pillars, dimensions, or components of sustainability.

What does environmental sustainability require?

It requires maintaining the natural systems and resources that support life while reducing pollution, resource depletion, biodiversity loss, and other harmful environmental impacts.

What does economic sustainability require?

It requires maintaining economic activity and human well-being over time without imposing environmental or social costs that undermine future prosperity.

What does social sustainability address?

It addresses whether people can live healthy, fair, empowered, connected, and meaningful lives without structural barriers to participation or well-being.

How does the nested model of sustainability differ from the three-intersecting-circles model?

The nested model places the economy within society and society within the biosphere, emphasizing that economic and social systems are constrained by environmental limits.

Why do many sustainability scholars give environmental integrity a foundational role?

Economic and social systems depend on functioning ecological systems, while some ecological functions cannot be replaced by technology or human-made capital.

Why is sustainability difficult to define and measure with a single number?

Sustainability is complex, context-dependent, and changes over time. Environmental, social, and economic conditions may improve or worsen simultaneously, so no universal indicator captures every situation.

What types of tools are used to assess sustainability?

Common tools include indicators, benchmarks, audits, standards, certification systems, sustainability indices, corporate sustainability reports, and triple-bottom-line accounting.

Triple-bottom-line accounting

An approach that evaluates an organization's performance using environmental, social, and economic outcomes rather than financial performance alone.

What is decoupling in sustainable economic development?

Decoupling means increasing economic output while reducing environmental impact, often by using fewer resources or producing less pollution per unit of output.

How can resource intensity be represented quantitatively?

Resource intensity can be expressed as $\text{resource intensity}=\frac{\text{resource consumed}}{\text{economic or physical output}}$. Lower resource intensity indicates more output per unit of resource.

Why is economic growth difficult to reconcile with environmental sustainability?

Growth can increase resource extraction, energy use, waste, and pollution. The challenge is to improve welfare while reducing environmental impact per unit of output and staying within ecological limits.

Weak sustainability

The view that human-made capital, technology, and infrastructure can replace much of the lost natural capital, such as environmental resources and services.

Strong sustainability

The view that important natural functions cannot be replaced by technology or human-made capital, so ecological integrity must be preserved.

Why does biodiversity support strong sustainability?

Biodiversity contributes to ecosystem functions such as pollination, soil fertility, clean water, and climate regulation. Many of these functions may be difficult or impossible to fully replace once lost.

Natural capital

The stock of environmental resources and systems—such as fertile soil, clean water, biodiversity, and climate-regulating ecosystems—that provides benefits to society.

How can pollution reduction improve environmental sustainability?

Reducing pollution lowers damage to air, water, soil, ecosystems, and human health. In chemistry-related systems, this can involve reducing hazardous substances, emissions, and persistent waste.

How are poverty and environmental degradation related?

Poverty can contribute to environmental damage when people lack alternatives to resource depletion, while environmental degradation can worsen poverty by reducing access to food, water, energy, health, and livelihoods.

What is social equity in sustainability?

Social equity means distributing environmental benefits, economic opportunities, and environmental burdens fairly within and between countries and across generations.

Why must environmental and social sustainability often be addressed together?

Environmental policies can affect groups differently; for example, transportation changes, disasters, or carbon-related costs may disproportionately burden marginalized populations. Fair participation and representation improve the likelihood that policies are effective and equitable.

What barriers make global sustainability problems difficult to solve?

The problems involve complex, interconnected systems and require cooperation across nations, institutions, businesses, and individuals. International organizations may also lack effective enforcement and sanctioning mechanisms.

Why can sustainability policies involve trade-offs?

A policy may improve one dimension while harming another—for example, economic development may reduce poverty but increase resource use or pollution. Sustainable decision-making seeks to identify and minimize these conflicts rather than assuming all goals automatically align.

What does it mean to say that sustainability is scale- and place-dependent?

An action that is sustainable in one location or time period may not be sustainable elsewhere or indefinitely. Resource availability, ecological limits, population, technology, and social conditions vary with spatial and temporal scale.

What roles can individuals and communities play in a sustainability transition?

They can act as consumers, voters, activists, and community members by changing behaviors, supporting policies, participating in decision-making, and contributing local knowledge and governance.

What is greenwashing, and why does it undermine sustainability?

Greenwashing is presenting a product, organization, or policy as environmentally responsible without adequately supporting that claim. It creates confusion and can conceal continued environmental harm.

What is sustainable agriculture?

Agriculture that produces food and other crops over the long term while conserving soil and water, maintaining biodiversity, and minimizing pollution and depletion of natural resources.

How does crop rotation promote sustainable agriculture?

Growing different crops in a planned sequence helps maintain soil nutrients, interrupt pest and disease cycles, reduce erosion, and decrease dependence on synthetic fertilizers and pesticides.

How does contour plowing reduce environmental impacts?

Plowing along the natural contours of a slope slows water flow, reducing soil erosion, runoff, and loss of nutrients from agricultural fields.

How do terraces support sustainable agriculture?

Terraces divide steep slopes into level steps that slow runoff, increase water infiltration, and reduce soil erosion and nutrient loss.

What is agroforestry, and why is it sustainable?

Agroforestry integrates trees with crops or livestock. Trees can reduce erosion, improve soil structure, provide habitat and shade, store carbon, and supply products while food is produced.

How can sustainable agricultural practices reduce water pollution?

Practices such as contour plowing, terracing, crop rotation, and agroforestry reduce erosion and runoff, limiting the movement of sediment, fertilizers, and pesticides into waterways.