– Všetko čo študent potrebuje
Pondelok, 15. augusta 2022
Energy resources
Dátum pridania: 08.06.2005 Oznámkuj: 12345
Autor referátu: SSAG
Jazyk: Angličtina Počet slov: 1 590
Referát vhodný pre: Gymnázium Počet A4: 5
Priemerná známka: 3.00 Rýchle čítanie: 8m 20s
Pomalé čítanie: 12m 30s
We have to share these resources with all the others lifeforms on The Earth.

We divide natural resources into renewable and non-renewable. Renewable resources are the ones that will never run out (maybe!!).
Resources such as trees, fish, oxygen, and fresh water are renewable resources as they can be continually reproduced. Fresh water from the Earth's recycling process, fresh air from the oxygen produced by plants and trees, and trees and fish which can reproduce themselves

We are destroying the cycle of reproduction of trees and fish by our habits. For example the number of fish extremely decreased after we began with massive worldwide fishing in 20th century. Forests are not destroyed only by massive logging but we destroy them also by regular “logging” of “x-mas trees”.
Real wooden trees are still more popular than imitational and ecological trees. For how long?

Industrialization brings big progress and also big pollution!!
When people think about air pollution, they usually think about smog, acid rain, and other forms of outdoor air pollution. But did you know that air pollution also could exist inside homes and other buildings? It can, and every year, chemical substances in the air within buildings affect the health of many people.

Renewable resources can become a non-renewable ones. How? Listen:
Plants and Animals - When plant and animal species become extinct.
Fresh water - When fresh groundwater gets used up and no rain falls, sometimes for years. More then 75% of underground water is non-renewable. From chemical spills is the nature so toxic that the water and surrounding soils are polluted for a lifetime. And think about population growth -70 million people are added to our planet every year.
Trees - When a forest of trees is clear-cutted, it can change the soil and the climate of the ecosystem so new trees cannot grow, plants die, and animals lose their habitat and die or leave the area. A natural forest has a variety of trees, plants, and life forms. A natural forest creates climate. These ecosystems evolved over a very, very long period of time and through many geologic and climatic changes. Should humans, then, be allowed to buy whole ecosystems to destroy them for money? That is what happens when a forest is clear cutted.

Oxygen/Clean Air - When forests and plants (on land and in our oceans) are destroyed or die from acid rain and pollution, they can no longer absorb carbon dioxide from the air, and release oxygen into the atmosphere. When rivers are polluted by chemicals and erosion, oxygen is putted away from the water and living things die.
Land/Soil - When land is overgrazed or the nutrients in the soil used up from improper farming practices, the soil cannot renew itself and plants and crops cannot grow. Crop rotation is one way to help maintain soil fertility. When natural vegetation is removed from land to clear it for construction projects, mining operations or farmland, the plants and trees are no longer there to absorb rainwater and protect the soil from wind. Erosion occurs and the soil is washed away or soil particles are blown away in the winds.
Fish - When land is cleared of vegetation in watershed areas that drain into rivers, lakes, streams, estuaries, etc., soil erodes into the water and the silt smothers the fish and plant life. When pollutants drain into these waters, the toxins kill aquatic life and the pollutants can be carried through the water far distances.
Biospheres of living things - When pollution destroys an area, like the devastating Exxon Valdez oil spill and the Chernobyl nuclear accident. Environmental disasters such as these affect whole biospheres and damage all living things for thousands of miles for many, many years. Nuclear contamination can last for longer than lifetimes.

Renewable sources are defined as:
"capable of being replaced by natural ecological cycles or sound management practices"
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