IB Environmental systems and societies Topic 4.2E Freshwater Resources and Use Revision Notes (HL)

IB Environmental systems and societies Topic 4.2E Freshwater Resources and Use Revision Notes (HL) | RevisionDojo

Written by official IB examiners

Freshwater is one of nine planetary boundaries, and staying within it protects the water systems all life depends on

Freshwater is one of the nine planetary boundaries identified by the Stockholm Resilience Centre, which define the safe operating limits for humanity.
Crossing these boundaries risks triggering abrupt, large-scale, and potentially irreversible environmental changes.
Freshwater use is critical because it underpins all biological, climatic, and human systems.

The freshwater boundary marks the safe limit of freshwater change before hydrological systems are disrupted

Definition

Planetary boundary

A planetary boundary is a threshold beyond which human activities risk causing catastrophic environmental change.

Freshwater systems are vital for ecosystem stability, agriculture, industry, and human health.
The boundary reflects the maximum safe level of freshwater change before global hydrological systems are disrupted.

The boundary tracks two kinds of freshwater: blue water and green water

Blue water
1. Surface water and groundwater used for human consumption, irrigation, and industry.
2. Excess withdrawal leads to aquifer depletion, dried-up rivers, and reduced hydropower potential.
Green water
1. Water held in soil moisture and transpired by vegetation.
2. Changes affect plant growth, carbon cycling, and local climate regulation.

Note

The boundary was renamed from “freshwater use” to “freshwater change” in 2022.
The update added green water (used by vegetation) alongside blue water (human-extracted).

Rising demand, deforestation, and climate change push freshwater beyond safe limits

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Duis aute irure dolor in reprehenderit

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Note

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Excepteur sint occaecat cupidatat non proident

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Tip

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Freshwater is one of nine planetary boundaries, and staying within it protects the water systems all life depends on

Freshwater is one of the nine planetary boundaries identified by the Stockholm Resilience Centre, which define the safe operating limits for humanity.
Crossing these boundaries risks triggering abrupt, large-scale, and potentially irreversible environmental changes.
Freshwater use is critical because it underpins all biological, climatic, and human systems.

The freshwater boundary marks the safe limit of freshwater change before hydrological systems are disrupted

Definition

Planetary boundary

A planetary boundary is a threshold beyond which human activities risk causing catastrophic environmental change.

Freshwater systems are vital for ecosystem stability, agriculture, industry, and human health.
The boundary reflects the maximum safe level of freshwater change before global hydrological systems are disrupted.

The boundary tracks two kinds of freshwater: blue water and green water

Blue water
1. Surface water and groundwater used for human consumption, irrigation, and industry.
2. Excess withdrawal leads to aquifer depletion, dried-up rivers, and reduced hydropower potential.
Green water
1. Water held in soil moisture and transpired by vegetation.
2. Changes affect plant growth, carbon cycling, and local climate regulation.

Note

The boundary was renamed from “freshwater use” to “freshwater change” in 2022.
The update added green water (used by vegetation) alongside blue water (human-extracted).

Rising demand, deforestation, and climate change push freshwater beyond safe limits

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

IB Environmental systems and societies 4.2E Freshwater Resources and Use Notes

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

Freshwater is one of nine planetary boundaries, and staying within it protects the water systems all life depends on

The freshwater boundary marks the safe limit of freshwater change before hydrological systems are disrupted

The boundary tracks two kinds of freshwater: blue water and green water

Rising demand, deforestation, and climate change push freshwater beyond safe limits

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Freshwater is one of nine planetary boundaries, and staying within it protects the water systems all life depends on

The freshwater boundary marks the safe limit of freshwater change before hydrological systems are disrupted

The boundary tracks two kinds of freshwater: blue water and green water

Rising demand, deforestation, and climate change push freshwater beyond safe limits

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account