Non Renewable Energy
A non renewable resource is one which can not sustain its consumption rate. Many of our fossil fuel based fuels such as coal, oil gas and petroleum have a finite extraction lifetime. Soon we will face a very quick decline of the availability of easily accessible non renewable sources and after a few desperate decades of extracting this resource from oil shale we will reach a point where the amount of fuel required to mine and process the fuel is equal to the amount of fuel extracted and we will have run out.
Although somewhat on its own in all this, Nuclear energy many consider to be non renewable because of the amount of easily accessible uranium. Uranium also takes an enormous amount of water and fossil fuel to refine thus adding to the cost of the power station. Decommissioning of nuclear power stations has its own challenges and there are other aspects worth considering as well.
Currently nuclear power has a limited place in the world's energy mix, however we certainly have no need for it in Australia, and the sooner we can stop refining uranium the better. There are some major steps forward with Nuclear however so it is important not to let it disappear off the radar, however investment into nuclear energy should never be at the expense of research and development into renewables, particularly looking at the challenges we face with renewables in Australia.