>> enough for our needs <b>should</b> be sufficient

That is the point. It should be enough, but some people <i>want</i> heated toilet seats and suchlike. They don't <i>need</i> them. Therefore we ('we' as in the western world, in general kinda thing) <i>want</i> loads, but don't <i>need</i> loads.

We ('we' as in the world fullstop) desperately <i>need</i> power sources that lessen teh burden on the eco system of our <i>wants</i>.