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Topic: Physics
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- Dams improve conditions for irrigation.
- Provides flood.
- Can linger drinking water.
- Can make rivers navigable.
- Provides low-cost electricity when the dam is in place.
- Hydropower is available all year round which provides stability for electricity consumers.
- No dangerous emissions occur and hydropower is a clean form of energy.


- Dams have negative social, environmental and economic consequences.
- Hydropower means major interventions in nature and the surrounding flora and fauna damage.
- Of salmon migration back to their spawning grounds have been disturbed by the vibrations plant
- Many people's livelihoods are also negatively affected by the effects below
dam: weaker fish, water quality, lower water levels in the river and reduced
fertility of agricultural land and forests as a result of reduced access to natural
fertilizers and irrigation from the river's seasonal floods.
- Dams also spreads water-borne diseases such as malaria.


- The positive aspect of biomass is primarily that both environmental and economic gains by it.
- It does not contribute to the greenhouse effect and hence causes no emissions of sulfur, such as oil,
- Biofuels are renewable, meaning they can be recreated.
- The biggest problem is that there are, as profitable, because of not having
enough resources because the demand yet not so great.
- Upon combustion, emissions of nitrogen oxides and dust. In order not to exploit the forest land
On nutritional so the ashes can be returned and widely distributed over the forest floor.


- Wind power is renewable.
- It makes no försurande- or eutrophic effects.
- When removing so leaving wind no traces in our landscapes.
- Wind power also saves nature from the mining of coal, uranium and scattering of ashes.

- The need, inter alia, stand on the open areas and those places there is not everywhere.
- They sound great and can cause television interference.
- Wind power has also been shown to lead to problems for our birds, flying in the fast
rotating propellers.
- Wind power requires the right conditions, ie that it is very windy (5-25 m / s), otherwise it will not
effect is particularly large.


- Nuclear energy is very environmentally friendly, so location is not occurring accidents with radioactive waste.
- Nuclear energy is inexpensive to operate and has a very high energy yield
- Nuclear power emits no toxic gases to the atmosphere.
- Nuclear power plants produce far more electricity than example. wind turbine does.
- It requires small amounts of uranium to get a large amount of energy.
- There will be no carbon footprint of nuclear power.
- Nuclear power is expensive to expand.
- Nuclear power's waste is radioactive and therefore harmful to all living things. It is difficult to
store the waste.
- The greatest concern with nuclear power is that there is still a risk that a reactor accident
can occur.
- The emissions that are becoming very dangerous if not handled properly.
- Long time before the spent fuel is harmless.

Fossil fuels


Natural gas:
- Lower emissions of carbon dioxide and nitrogen dioxide, compared to burning coal and oil.
- Flexible
- Effective
- Cheap
- Contains no hazardous substances such as heavy metals

Oil and coal:
- Easy to handle
- Easy to transport
- Cheap

- Fossil fuels are dwindling sources of energy, ie they will run out before it has formed
- Combustion of fossil fuels is a major contributor to the greenhouse effect
- Combustion causes acidification.
- Oil spills.

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