پاور پوینت (اسلاید) Alternative sources of energy
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محتواب برخی از اسلاید ها :
محتوای اسلاید 3 : Why is there a need for alternative sources of energyThe graph that you completed last time shows just how much we rely on fossil fuels
90 per cent of the worlds energy supply’s come from fossil fuels
Fossil fuels are convenient and relatively cheap – a litre of petrol in 1998 would have been 20p if there was no tax added!
محتوای اسلاید 4 :
محتوای اسلاید 5 : How much longer can we depend on fossil fuelsBecause they are fossil fuels they DO have a life expectancy
“Oil has 40 – 50 years left”
In 1960 they said this too! – what has happened is that we have found new reserves of oil and new technology has made the oil we use last longer
محتوای اسلاید 6 :
محتوای اسلاید 7 : Burning fossil fuels has increased atmospheric pollution.
Vehicle exhausts contribute to acid rain more so than power stations burning coal.
The carbon stored in fossil fuels is released as carbon dioxide when they are burnt – this leads to the green house effect and global warming
Don’t get this confused with the hole in the ozone layer – this was caused by CFC’s
محتوای اسلاید 8 : The Green House Effect
محتوای اسلاید 9 : Coal has the longest life expectancy
Environmentalists dislike the burning of this fossil fuel the most as it gives off the most CO2
Unless cheap alternatives to burning coal are found there is likely to be an increase in its use – especially from Asia which has a lot!
محتوای اسلاید 10 :
محتوای اسلاید 11 : So what are the alternative energy sources to fossil fuelsOnce upon a time – nuclear power was seen as the answer. Huge amounts of power could be produced from a small amount of uranium
However, it was not well known that it produced radioactive waste
The waste is dangerous to health and life for hundreds of years
There is no secure place for storage.
Public confidence has also been shattered by the explosion at Chernobyl in 1986
محتوای اسلاید 12 :
محتوای اسلاید 13 : Other hopesNow that nuclear power is considered too risky hopes lie with things like sun, water, wind, waves and tides.
محتوای اسلاید 14 :
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محتوای اسلاید 17 :
محتوای اسلاید 18 : Advantages of using natural sources of energyThey are inexhaustible – they will always be available – they are renewable
They are clean and will not damage the Earth
There are several types – so one or more of them is present in each country
Most natural sources can be used on a small scale and serve local needs therefore cutting costs of transmitting the energy
محتوای اسلاید 19 : ReviewExplain why fossil fuels are:
(b) in limited supply
محتوای اسلاید 20 : Put forward arguments in favour of:(a) Using natural gas instead of coal
(b) using nuclear power rather than oil
(c) using alternative sources of energy rather than nuclear power