H. T. Goranson, Lead Scientist at Sirius-Beta Corp, Senior Scientist with the US Defense Advanced Research Projects Agency, and the author of The Agile Virtual Enterprise says that we need to be developing Alternatives to Alternative Energy. His claim is that presently proposed energy sources are not radical enough to solve the growing global energy challenge.
His view is that what is needed is an international Manhattan project to do the basic science that could lead to technological breakthrough. He argues that the cost, though large, is minimal in relation to the cost of not doing so. Good short read.