Human to Biosphere [Compatibility Mode]

7/29/2019 Human to Biosphere [Compatibility Mode]

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Humans in the Biosphere


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The Tragedy of the Commons

Areas used by everyone are no onesresponsibility


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Renewable Resources

Resources canregenerate (living) or

Resources that can be

recycled throughbiogeochemical cycles

Examples

Trees

Water


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Renewable resources are NOT

necessarily UNLIMITED.

Freshwater is arenewable resource,BUT there are events

that CAN make it verylimited. For example:

Drought

Pollution


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Nonrenewable Resources

Cannot be replenishedby natural processes.

Exam les:

Fossil fuels


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Is a tree population renewable

or nonrenewable?

Individual trees arerenewable

A o ulation of trees

may not be, becausethe ecosystem theywere in may change

forever once the treesare gone.


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Sustainable Development

Using resources without depleting them Providing for human needs without causing

- Must take into account

Functioning of ecosystems

Human economic systems


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Sustainable Development

Strategy - Example

Using insects insteadpesticides to controlpests


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Land Resources - Soil

Renewable or not? Renewable if managed properly


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Mismanagement of Soil

Resources

Soil Erosion Wearing away of surface soil by water and

Results when land is plowed, and roots that

hold soil in place are removed


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Mismanagement of SoilResources

Desertification Misuse of soil causes

once productive areas

to ecome eserts Dry climate Farming

Overgrazing

Drought


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Forest Resources

Ways in which forestresources are used bypeople

Building Burning


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Forest Resources

Ways in which forests provide ecologicalservices

Forests as lungs of the Earth

Absorb CO2 and release O2 Store nutrients

Provide habitat and food for organisms

Moderate climate Limit soil erosion

Protect freshwater supplies


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Are Forests RenewableResources?

Maybe it depends on the forest Our temperate deciduous forests seem to

come back pretty well after cutting, though not

always exactly as they were Old Growth Forests are NOT renewable

Ancient trees and ecosystems

Will not be replaced by a similar ecosystem if cut The plants and animals dependent on the anceint trees inthe system would die

Even if allowed to come back, the ecosystem would neverreturn to its present state.


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Old Growth Forest


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Human to Biosphere [Compatibility Mode]