Developing new energy sources

Stephen L. Sass writes:

If there is anything to be learned from history, it?s that we need to face the harsh reality of fossil fuel scarcity and begin something like a Manhattan project to develop clean, economical, and preferably sustainable new sources of energy.

Prof. Sass wrote an excellent book, "The Substance of Civilization: Materials and Human History From the Stone Age to the Age of Silicon", but this comment is a little strange. The Manhattan Project has already developed an energy source that is cleaner, more economical, and more sustainable than fossil fuels. There have also been many other big govt energy projects, such as fusion power, that have been big failures. He should be suggesting that we take more advantage of the one Manhattan Project that was actually successful.