An almost undeniable fact about energy resources is that fossil fuels won't last forever. Whether or not you believe they affect the environment, alternative sources of power will have to be found and used on a mass scale, to enable us to use business electricity long after coal, gas or oil has run out.
As of yet, the next best alternative to fossil fuels is nuclear power. It doesn't produce Carbon Dioxide, it is more efficient as you can obtain huge amounts of energy from relatively tiny amounts of fuel, it is reliable and very little waste is made. It seems that as an alternative to fossil fuels, nuclear power will take some beating. There are of course other ways, such as tidal power, solar power and wind power, but these all have major flaws that must be ironed out before they rival nuclear power in efficiency, cost-effectiveness and reliability.