ESS

Topic 1 revision


Jun 18, 2022

Environmental movement

Different lecels of influence:
individuals
Independent pressure groups (NGOs)
Governments
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

Technology-cented
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)
static
And Stability
stable
unstable

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