Disadvantages of other energy sources:

Maggie- Coal:
Disdvantages-
  • To dig up coal, we have to create mines which can be dangerous and not very nice to look at.
  • Transporting coal by lorry and train from the mine to the power station causes pollution.
  • Burning coal produces polluting gases like sulphur dioxide which make acid rain.
  • Of all energy sources, burning coal releases the most greenhouse gases which may add to global warming.
  • Coal is a non-renewable source and will run out in about 100 years.
  • Coal miners can be affected by black lung disease or pneumoconiosis and also emphysema if they breathe in too much of the coal dust.
http://www.childrensuniversity.manchester.ac.uk/interactives/science/energy/discovermore/advantages.pdf

Miranda.13: oil
  • Oil is a non-renewable energy source that takes millions of years to form and therefore once existing and any new reserves are depleted there is no way to obtain more.
  • While oil is relatively easy to transport, one of the more common transportation methods is shipping oil from port to port by ‘supertanker’ – massive purpose-built tanker ships capable of transporting enormous quantities of oil by sea. While spills are rare they are by no means unheard of and the resulting inevitably catastrophic effect on marine life, birds and coastlines is evident for many years.
  • Burning oil generates carbon dioxide, a ‘greenhouse gas’ – although to a slightly lesser extent than coal in terms of the energy extracted.
  • Oil contains sulphur which when burnt forms sulphur dioxide and sulphur trioxide – these compounds combine with atmospheric moisture to form sulphuric acid, leading to ‘acid rain’. This can lead to destruction of forests and the progressive erosion of rock and masonry structures, both natural and man-made. The use of low-sulphur fuels can help to reduce the impact of this.
  • Oil is neither as clean nor efficient in use as natural gas.
  • Many of the countries where oil can be found are politically unstable – around 70% of the world’s oil reserves are believed to be located in the Middle East. Developed nations with an oil-dependency have a vested interest in such countries and may seek to influence the politics of such countries to their own advantage.
  • Locating additional oil reserves is an extremely costly ongoing process with no guarantee of success.
  • While many of the products obtained from oil are hugely beneficial to mankind, many are
  • http://fossil-fuel.co.uk/oil/the-disadvantages-of-oil

Justin: Tidal

right now tides do not produce a lot of electricity so its not very efficient. Barrages across river estuaries can change the flow of the water, and because of that it is the place for birds and other wildlife to live, because of this, there are some wildlife that can be in danger.
http://www.odec.ca/projects/2007/clar7s3/index_files/Page567.htm

  1. High Initial Capital Investment - Tidal Barrages require massive investment to construct a Barrage or Dam across a river estuary.This is comparable to construction of a massive dam for Hydro Power.This is perhaps the biggest disadvantage of this technology
  2. Limited Locations – The US DOE estimates that there are only about 40 locations in the world capable of supporting Tidal Barrages.This is because this Tidal Energy Technology requires sizable Tides for the Power Plant to be built.The limited number of locations is a big hurdle.
  3. Effect on Marine Life - The operation of commercial Tidal Power Stations has known to moderately affect the marine life around the Power Plant.It leads to disruption in movement and growth of fishes and other marine life.Can also lead to increase in silt.Turbines can also kill fish passing through it.
  4. Immature Technology – Except for Tidal Barrage,the other forms of Technology generating Tidal or Wave Power are quite immature,costly and unproven
  5. Long Gestation Time – The cost and time overruns can be huge for Tidal Power Plants leading to their cancellation just like that of the Severn Barrage in the UK.Many of the Tidal Power Stations like the gigantic Plant being planned in Russia will never come to fruition because of the very long gestation time.
  6. Difficulty in Transmission of Tidal Electricity – Some forms of Tidal Power generate power quite far away from the consumption of electricity.Transportation of Tidal Energy can be quite combersome and expensive.
  7. Weather Effects – Severe Weather like Storms and Typhoons can be quite devastating on the Tidal Power Equipment especially those place on the Sea Floor.

http://www.greenworldinvestor.com/2011/03/15/advantages-and-disadvantages-of-tidal-energy/

Annonda: nuclear
1. the nuclear fission creates a big volume of radioactive waste. This waste can be easily used to make a nuclear bomb.
2. Living beings, exposed to this kind of radiation, especially from nuclear waste, suffer from many problems like cancer, weird growths and sometimes can also lead to death.
3.A nuclear melt down.
4. The meltdown releases many toxic elements into the environment contaminating a huge area.
5.A nuclear contamination is capable of wiping out mankind.
6.it is not a renewable energy resource

Makiah - Natural Gas
http://www.livestrong.com/article/121133-disadvantages-natural-gas-energy/

1. Natural Gas is the reason for prehistoric animals and plants today.
2.

Kristen Hagen
  • Large reservoirs required for the operation of hydroelectric power stations result in submersion of extensive areas upstream of the dams, destroying biologically rich and productive lowland and riverine valley forests, marshland and grasslands.
  • Hydroelectric projects can be disruptive to surrounding aquatic ecosystems both upstream and downstream of the plant site.
  • The disadvantages of hydroelectric energy include: the high potential for extreme damage to the local ecosystem; the high cost of construction; the sheer size and scale of hydroelectric dams and the possibility of the potential devastation of a dam breaking.
  • All of the problems associated with large scale hydro are themselves potentially very large due to the scale of the construction. The environmental impact of a poorly built dam cannot be understated; hydroelectric energy also has one of the highest rates of death per kW (due to a few accidents where dams breaking have taken many lives.)
  • Smaller models depend on availability of fast flowing streams or rivers
  • Run-of-the-River plants can impact the mobility of fish and other riverlife. NOTE: Building a fish ladder can lessen this negative aspect of hydroelectric power

http://en.wikipedia.org/wiki/Hydroelectricity
http://www.howtopowertheworld.com/disadvantages-of-hydroelectric-energy.shtml
http://library.thinkquest.org/20331/types/hydro/advant.html