So we have seen where we need energy, now where do we get it from?
For our bodies we use the chemical energy in food, our food is grown or if animals reared. The farmer keeps enough seeds and / or young animals as so he can produce a crop the following year, this is what we mean when we say something is renewable.
However the fuels Fossil fuels we burn to provide heat at home and to make electricity are not renewable really. The natural process to make coal, oil turf and gas take 100,000's of years and we are using the earths supply in less than 200 years. Nature will not have replenished herself when we are finished with the fossil fuels already present.
These fuels also release CO2, CO2 is a greenhouse gas. Greenhouse gases increase the temperature of the Earth leading to global warming. This melts Ice caps like the north and south poles & greenland, leading to sea level to increase, causing flooding and destructive weather conditions.
You may have heard of an energy crisis going on at some time, this usually happens when the price of fuel goes up. The price of things goes up when supply is low or the demand is high. The oil that we need to drive cars, heat homes, make electricity comes from the earth. This is becoming more and more hard to find as the supplies run out. and so the price of energy in the form of fossil fuels will rise in the future, which in turn will increase the prices sought for all forms of energy.
We refer to fuel sources as non-renewable if their stocks cannot be replenished within a short space of time.
Renewable energy sources will not run out, as time goes by the stocks of this energy raw material do not decrease.
OP16 classify sources of energy as renewable or non-renewable
Sources of Energy
Examples of Renewable energy include,
- Wind, http://www.brainpop.com/science/energy/windenergy/
- Hydroelectric http://www.youtube.com/watch?v=MAWNPqSvbeY
- Wave and Tidal Power http://vimeo.com/12912603
- Nuclear energy
Write a short note on each of these renewable sources of energy.
- equipment required,
- the uptime Vs the downtime,
- public concerns,
- cost to build,
- cost to environment.
In 2004, renewable energies contributed to less than 9% of the world consumption of energy
The bbc.co.uk and its current opinion on renewables http://www.bbc.co.uk/news/science-environment-13337864
for comparative usage more recently
Check out the following link to encourage discussion on oil alternatives.
The Worlds Largest Wind Farm (2010) and public opinion of