Topic 1 revision

Jun 18, 2022

Environmental movement

Different lecels of influence:
Independent pressure groups (NGOs)
Intergovernmental bodies (e.g. United Nations)
historical events

Environmental Value Systems: Anthropocentric

people centerd
Nature here to benefit humankind
Use taxes, regulation, legislation to sustainably manage

Environmental Value Systems Technocentric

Technological developments can solve any envirnmental problem
Focused on economic growth

The Systems Approach

A system is a set of interrelated parts working together to make a complex whole
What does it involve:
Simplifying complex environmental systems
Outlining its inputs + outputs
Emergent properties

Systems are composed of…

Storages: where energy or matter remains
Flows: where energy or matter move between storages (inputs and outputs)
Can be a:
transfere: a change in location
Transformation: a change in the chemical nature, state or form
And they obay certain laws:
1st law of thermodynamics/Law of censervation of energy: Energy cannot be created or destroyed, only . E.g. light to heat, chemical to electrical
2nd law of thermodynamics: Thhe entropy (disorder) of a system increases over time; Energy conversations are only 10% efficient: energy is always lost

Equilibrium and feedback loops

Equilibrium: The tendency of a system to return to its original state following a disturbance.
Distinguish in terms of activity:
steady-state (dynamic)
And Stability

Positive and Negative feedback

negative Feedback → negates change! (E.g. predator prey interactions)
Positive feedback → amplifies change (e.g. albedo in global warming)

Topic 2 revisions

Jun 18, 2022