I agree with Alcaray.

I don't think solar is a solution, if it even gets to 10% of our energy needs I will be really surprised. The same goes for all the other "Green" and renewable sources. They won't hurt, and they should certainly be encouraged and developed as much as possible, but they won't solve the problem.

They only things that will really solve the problem are

1) Massive conservation, particularly in our transportation and building . We need to design our cities for the convenience of people, not automobiles, and exploit "green" architecture to minimize our need for electrical cooling. Hell, the Romans designed buildings that worked in Italy's climate, there's no reason we can't.

2)Massive re-introduction of nuclear power, but do it right this time; not as pork barrel for the electrical industry.

3) We're going to have to learn to get along with less. Instead of a house in the suburbs with two cars, an apartment in the city with good public transport. We don't have to go back to 18th century pastoral society, we can live like they do in Manhattan. If you want to live in the country and own a horse, great, but you should be willing to pay for it. All of it.

4) Massive investment in new technology. Even if it doesn't succeed, you always turn up something useful, and who knows? Maybe we can get lucky and come up with fusion power or microwave solar satellites in orbit.

This is all technically, and financially within our reach. We can have our cake and eat it too if we're willing to eat less and share more. Whether this is politically possible is something else.

Of course. We could just do nothing and hope we get lucky with #4.