| 9.1 Human Activities that Endanger an Ecosystem - introduction - pollution
- strategies to solve problems related to pollution
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| 9.2 The Greenhouse Effect and the Thinning of the Ozone Layer - The greenhouse effect - The thinning of the ozone layer - Impact of global warming and the thinning of the 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 increased population on the ecosystem - Managing development activities to ensure a balanced ecosystem
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9.1 HUMAN ACTIVITIES THAT ENDANGER AN ECOSYSTEM
> An environment that fulfils the need of living organisms and pollution is at the minimal level such that humans and other living things can live comfortably.
a) Air is clean and fresh to safeguard the respiratory system b) Water is clean to safeguard aquatic life
c) Forest is sustained to safeguard timber and survival of wild animals d) Topsoil continues to be fertile and not eroded to safeguard agricultural activities e) The natural environment is preserved
Human activities that threaten the ecosystem are:
Unplanned development and mismanaged development have adverse impact on the ecosystem such as:
Topsoil is removed causing the land to be unsuitable for farming activities
| Sudden and rapid floods in low lying areas due to poor surface run-off causing loss to lives and property
| EXTINCTION OF FLORA AND FAUNA
| A sudden fall of rocks and earth down a hill slope due to an unstable and denuded hill slope causing disruptions to infrastructure and transportation and loss of lives and property
| Rapid algae growth in an aquatic system due to artificial Nutrient enrichment causing waterways to be blocked and prevent light penetration in ponds or rivers. Thus, the rate of photosynthesis decreases, water plants cannot grow. This leads to low production of oxygen and few animals can live in it.
| The permanent removal of trees from forests
| ENVIRONMENTAL POLLUTION
| Air pollution. Water pollution. Thermal pollution. Noise Pollution
| GREENHOUSE EFFECT
| The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions
| GLOBAL WARMING
| The rise in the average temperature of Earth's atmosphere and oceans
| THINNING OF OZONE LAYER
SEVERE CLIMATE CHANGES
| Winters are getting colder, rainfall is getting heavier and many countries are facing prolonged drought.
Pollution is undesirable changes in the natural environment due to the accumulation of pollutants.
There are 4 types of pollution:
A) AIR POLLUTION
Air pollution is the addition of undesirable substances in air causing air quality to be unsuitable for living organisms and property
a) Motorized vehicles such as lorries and cars use fossil fuels like petrol and diesel. The combustion of these fuels releases gases like carbon monoxide, carbon dioxide, sculpture dioxide oxides of nitrogen and hydrocarbons lead and soot into the atmosphere.b) Industrial plants such as cement factories, chemical plants, sawmills and steel plants release waste in the form of gas like carbon dioxide, oxides of nitrogen, chlorine and solid waste such as dust, dirt and smoke into the atmospherec) Forest fires and open burning of solid wastes and rubbish release smoke, dust and carbon dioxide
| Effects a) Sculpture Dioxide and Nitrogen Dioxide
~ irritate eyes, damage cells...
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