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Environmental Capital and Carrying Capacity
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1
Question
Provide a concise, general definition of 'environment' as a noun.
Page 4
Answer
The environment is the surroundings or conditions in which a person, animal, or plant lives or operates; the setting or conditions in which a particular activity is carried on; and the natural world as a whole or in a particular geographical area, especially as affected by human activity.
2
Question
List four distinct senses or usages of the word 'environment'.
Page 4
Answer
1) The surroundings or conditions for a person, animal, or plant; 2) The setting or conditions for a particular activity; 3) The natural world as a whole or in a given geographical area, often influenced by humans; 4) Synonyms such as the natural world, nature, living world, the earth.
3
Question
Define 'natural capital' in environmental science terms.
Page 6
Answer
Natural capital is the natural environment and the biodiversity it contains that provide ecosystem goods and services essential to human needs — for example survival, climate regulation, habitat, water supply, food, fiber, fuel, recreation, cultural amenities, and raw materials for economic production.
4
Question
Give examples of natural resources and natural services (natural capital) shown in the diagram.
Page 6
Answer
Natural resources: air, water, soil, nonrenewable minerals (iron, sand), fossil fuels (coal, oil, natural gas), renewable energy (sun, wind, water flows). Natural services: air purification, climate control, UV protection (ozone layer), water purification, waste treatment, soil renewal, nutrient recycling, food production, pest and population control, habitat provision.
5
Question
What does the term 'Anthropogenic Planet' convey about human impact?
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Answer
It conveys that human activities now shape global systems — urban areas, roads, shipping routes, and air networks are widespread and alter the Earth's surface and processes, indicating humans are a dominant influence on the planet.
6
Question
Identify the primary categories of natural capital degradation shown in the cross-sectional diagram.
Page 7
Answer
Air pollution and climate change, soil erosion, aquifer depletion, shrinking forests, decreased wildlife habitats, species extinction, water pollution, and declining ocean fisheries.
7
Question
Explain how 'degradation of normally renewable natural resources' can occur even if a resource is renewable.
Page 7
Answer
Renewable resources can be degraded when the rate of use exceeds the rate of natural renewal or when human activities damage the systems that allow renewal. Examples include overfishing causing declining fisheries, excessive groundwater pumping depleting aquifers, and deforestation reducing forest renewal and habitats.
8
Question
Define 'carrying capacity' in an ecological context.
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Answer
Carrying capacity is the maximum population size of a species that a given environment can sustain indefinitely, considering availability of essential resources (food, water, shelter) and limiting factors such as competition, disease, and habitat availability.
9
Question
How can carrying capacity change over time?
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Answer
Carrying capacity is not fixed: it can increase with improvements in technology, resource management, or expanded resources, or it can decrease due to environmental degradation, resource depletion, or negative human activities.
10
Question
Describe the 'tragedy of the commons' illustrated by the grazing-sheep sequence.
Page 9
Answer
When a shared resource is used by multiple users, individual incentives to increase personal use can push total use beyond the resource’s carrying capacity. As some users overexploit the commons, the resource becomes degraded and the cost of degradation is borne by all users, eventually making the land unable to support the activity.
11
Question
Interpret the population projection scenarios (low, medium, high) and the likely 2050 world population according to the slide.
Page 8
Answer
The UN projections show three scenarios: low (1.5 children/woman) ~7.8 billion by 2050, medium (2.0 children/woman) ~9.5 billion by 2050, and high (2.5 children/woman) ~10.8 billion by 2050. The medium scenario (~9.5 billion) is considered the most likely.
12
Question
What are the environmental risks associated with overshooting carrying capacity as shown in the consumption vs time graph?
Page 10
Answer
Overshoot can temporarily raise consumption above carrying capacity, but it often leads to resource depletion and environmental degradation that reduces carrying capacity and results in population decline, collapse, or long-term loss of ecosystem services.
13
Question
Summarize the demographic transition stages shown and their effect on population growth.
Page 10
Answer
The demographic transition has four stages: preindustrial (high birth and death rates, low growth), transitional (death rates fall, birth rates remain high, rapid growth), industrial (birth rates begin to fall, growth slows), and postindustrial (low birth and death rates, population stabilizes or declines). Economic development tends to reduce birth rates after death rates decline.
14
Question
Explain how improvements in technology can temporarily alter the human population curve relative to carrying capacity.
Page 9
Answer
Technological improvements (e.g., agricultural advances, sanitation, energy extraction) can raise effective carrying capacity, allowing population and consumption to grow to a new higher plateau. However, if technologies cause environmental harm or are unsustainable, they can later contribute to a degraded carrying capacity.
15
Question
Give examples of human infrastructure and networks that illustrate the 'Anthropocene' footprint on a global map.
Page 5
Answer
Examples include dense urban areas (nighttime lights), extensive global roads and highways, major shipping routes across oceans, and global air networks connecting cities worldwide. These networks demonstrate large-scale human alteration and connectivity of Earth systems.
16
Question
Why are decreasing wildlife habitats and shrinking forests significant for ecosystem services?
Page 7
Answer
They reduce biodiversity, impair functions such as carbon storage, water regulation, soil stabilization, nutrient cycling, and pollination, and thus diminish the natural services humans rely on for food, climate regulation, and other goods, increasing vulnerability to environmental change.
17
Question
What is aquifer depletion and what are its potential downstream impacts?
Page 7
Answer
Aquifer depletion is the long-term lowering of groundwater levels due to extraction rates exceeding natural recharge. Impacts include reduced water availability for agriculture and human consumption, land subsidence, reduced surface water flows, ecosystem damage, and higher energy costs for pumping deeper water.
18
Question
How does soil erosion affect natural capital and long-term food production?
Page 6
Answer
Soil erosion removes fertile topsoil, reducing soil renewal and nutrient availability, which degrades land productivity, decreases food production capacity, and can lead to desertification and loss of arable land — thereby lowering natural capital and carrying capacity for agriculture.
19
Question
What does the phrase 'essential to basic human needs' refer to when discussing ecosystem goods and services?
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Answer
It refers to ecosystem outputs that directly support human survival and well-being, such as clean water, food, climate regulation, habitat for pollinators and species we depend on, fuel and fiber, and materials for economic production, plus cultural and recreational benefits.
20
Question
Why is the medium UN population projection often considered the 'most likely' scenario?
Page 8
Answer
Because it is based on moderate assumptions about future fertility (about 2.0 children per woman) and recognizes ongoing trends toward lower fertility with development; it balances optimistic (high fertility) and pessimistic (very low fertility) assumptions and aligns best with observed demographic transitions.
21
Question
What relationship between economic development and human population is suggested by the demographic transition figure?
Page 10
Answer
As societies industrialize and develop economically, death rates fall first (due to improved health and sanitation), followed by declines in birth rates, which eventually slows and stabilizes population growth; higher stages of development tend to lead to lower birth and death rates and more stable or declining populations.
22
Question
How does water pollution interact with declining ocean fisheries in the context of natural capital degradation?
Page 7
Answer
Water pollution (nutrient runoff, contaminants, plastics) degrades marine habitats, reduces water quality, causes dead zones, and harms fish stocks; combined with overfishing, this leads to declining ocean fisheries, meaning reduced food supply, loss of livelihoods, and diminished marine ecosystem services.
23
Question
What kinds of policy or management responses can prevent the tragedy of the commons (as shown with grazing example)?
Page 9
Answer
Responses include establishing property rights or quotas, community-based management with enforced rules, regulatory limits on use, economic instruments (taxes, fees, tradable permits), and cooperative agreements that internalize environmental costs so users consider long-term impacts.
24
Question
Why is it important to distinguish between 'natural resources' and 'natural services' when evaluating environmental problems?
Page 6
Answer
Because resources (materials we extract) and services (processes nature performs) contribute differently to human well-being; degradation of services (like water purification or pollination) can cause systemic failures not remedied simply by replacing resources — policy and management must protect both stocks and the processes that sustain them.