Cashing in on renewable energy

To paraphrase the economist Herb Stein, anything which cannot last forever will end. One thing that will eventually run out is oil, and whilst the world's known reserves of oil are sufficient for many decades, sooner or later humanity will need to be weaned off the stuff.

If the oil runs out and we don't have a suitable alternative, that will be the end of modern civilisation. So we need to develop renewable sources of energy, such as wind and solar power, as well as increasing the investment in tidal barrages, hydroelectric power and nuclear energy.