Energia

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  • Publicado : 4 de septiembre de 2010
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Energy is everywhere
Renewable resources and non-renewable resources

Renewable resources: is replaced by natural processes at a rate comparable or faster than its rate of consumption by humans
Non-renewable resources: is a natural resource which cannot be produced, re-grown, regenerated, or reused on a scale which can sustain its consumption rate.

Renewable resources | Non-renewableresources |
| |
* Like sunshine, wind, power from the ocean waves, and geothermal energy (heat from deep under the ground). | Oil is already in short supply |
* Water is renewable because it comes back again in the form of rain, but if a country is in drought, then water there is not renewable. | A non-renewable resource is something that we are using up, and at some time there will benone left worth harvesting. Once you use it, it's gone. |
* Crops and animals are renewable so long as there is water and food and the right climate for them. | |
* Biofuel like ethanol is renewable as long as we can grow the vegetation to produce it. | |

Advantages and disadvantages.
Renewable resources
Advantages
* We can use it repeatedly withoutdepleting it. |
* No polluting emissions. |
* Low cost applications when counting all costs. |
* Economical benefits. |
* No carbon dioxide |

disadvantages
* It is too expensive |
* solar -- panels are expensive. Governments are not all willing to buy home generated electricity. Not all climates are suitable for solar panels. |
* wind -- turbines areexpensive. Wind doesn't blow all the time, so they have to be part of a larger plan. |
* waves -- different technologies are being tried around the world. Scientists are still waiting for the ultimate development. |
* geothermal -- Difficult to drill two or three kilometers down into the earth. |
* biofuel -- often uses crop land or crops (like corn) to produce biofuel so the price ofcheap food goes up. |


Non-renewable
Advantages
* Coal is relatively cheap, with large deposits left that are reasonably easy to obtain, some coal being close to the surface. It is relatively easy to transport because it is a solid. |
* Nuclear fuel does not produce greenhouse gases, so will not contribute to global warming. There is a relatively long-lasting supply ofraw material. |
* These sources of energy are relatively cheap and most are easy to get and can be used to generate electricity. |

Disadvantages
* When these fuels are burned they produce the gas carbon dioxide, which is a greenhouse gas and is a major contributor to global warming. Transporting oil around the world can produce oil slicks, pollute beaches and harm wildlife. |
*Some sources of coal are deep below the ground, as in the UK. They can be difficult, costly and dangerous to mine. |
* The waste remains radioactive for a long time (100+ years). If the reaction is not contained and controlled well, then the nuclear reduction could go out of control, as at Chernobyl in 1986. Radioactive material could then escape into the environment. |

3 ways technologyaffects nature.
Negative
1. Pollution
2. deadlier weaponry
3. The use of cell phones while driving has caused so many car accidents.

Positive
1. Improve life style.
2. The quality of our environment is measured by the extent it provides you with things we think are valuable, such as food, shelter, clean water, or nice landscape.
3. Safety of human life.

forms ofenergy | Description | Positive and negative traits |
| | |
Fossils fuels | * Coal, oil and gas are called "fossil fuels" because they have been formed from the organic remains of prehistoric plants and animals. | * Very large amounts of electricity can be generated in one place using coal, fairly cheaply. * Burning any fossil fuel produces carbon dioxide, which contributes to the...
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