9. Endangered Ecosystem

9.1 Human Activities that Endangered an Ecosystem

What are the humans activities that threatened the ecosystem?

What are the impact of human activities on the ecosystem?

Pollution

Pollution - Any undesirable change in the Pollution - Any undesirable change in the natural environment caused by pollutant.natural environment caused by pollutant.

Pollutant – substance that cause pollutionPollutant – substance that cause pollution Pollution – being make dirtyPollution – being make dirty Types of environmental pollution:Types of environmental pollution:1.1. Air pollutionAir pollution2.2. Water pollutionWater pollution3.3. Soil pollutionSoil pollution4.4. Pollution caused by solid waste and Pollution caused by solid waste and

hazardous (dangerous) wastehazardous (dangerous) waste5.5. Noise pollutionNoise pollution

What are the sources of What are the sources of environmental pollution?environmental pollution?

What are the effects of environmental What are the effects of environmental pollution?pollution?

How to solve problems related to How to solve problems related to pollution?pollution?

9.2 The Greenhouse Effects and the Thinning of the Ozone Layer

Greenhouse effect.Greenhouse effect.

Occur when greenhouse gases Occur when greenhouse gases accumulates in the atmosphere to form a accumulates in the atmosphere to form a layer of gaseslayer of gases

Greenhouse gases – carbon dioxide, Greenhouse gases – carbon dioxide, chlorofluorocarbon, nitrogen oxides, chlorofluorocarbon, nitrogen oxides, methane and water vapourmethane and water vapour

The layer of gases trap the Sun’s heat The layer of gases trap the Sun’s heat around the world around the world

Greenhouse effect cause the global Greenhouse effect cause the global warmingwarming

Ozone layerOzone layer

located in the atmosphere.located in the atmosphere. consist of ozone molecules which consist of ozone molecules which

made up of three oxygen atom (Omade up of three oxygen atom (O33).).

act as protective shield that absorb act as protective shield that absorb the Sun’s harmful UV radiationthe Sun’s harmful UV radiation

Thinning of ozone layerThinning of ozone layer

Main cause - chlorofluorocarbon (CFC)Main cause - chlorofluorocarbon (CFC) CFC – man made gases used as CFC – man made gases used as

refrigerant (substance that make things refrigerant (substance that make things cold or freeze) and propellants cold or freeze) and propellants (compressed gas that forces out the (compressed gas that forces out the content of an aerosol container)content of an aerosol container)

CFC when exposed to UV radiation will CFC when exposed to UV radiation will release chlorine atom which can break release chlorine atom which can break down ozone molecules in chain reaction down ozone molecules in chain reaction causing the ozone layer become thinner.causing the ozone layer become thinner.

What are the impact of global warming and the thinning of ozone layer on the ecosystem?

9.3 The Importance of Proper Management of Development Activities and the Ecosystem

The need for development and the effects of an increasing population on the ecosystem

The increasing in population cause the increase in development.

Development interfere the balance in nature.

Unplanned and unmanaged development cause environmental problems.

Proper management of development activities are important

The importance of proper management of development activities Natural resource are non-renewable

means once they have been used they cannot be replaced.

They need to be manage in proper ways to maintain balance in nature.

Uncontrolled use of the natural resources will cause them to be used up.

Carry out sustainable development to balance the demands and the needs for resources with the need to conserve the resources.

The importance of proper management of development activities

Discussion

In you group, discuss about the measures taken in the management of development activities.

Measures taken in the management of development activities1. Implementation of laws

2. Use of technology

3. Education on the management of resources

4. Preservation and conservation activities

5. The practice of biological control

Exercise

Do Focus Practice 9.3 on page 219 in the textbook.