The use of Nuclear heat can produce cheap H2. The new technology that is being developed would use heat from nuclear reactors in a thermochemical process to decompose water into its basic components of oxygen and hydrogen. The water splitting is done using a copper-chlorine cycle. Thermochemical plants located near nuclear facilties that use the spent heat from the nuclear plants can generate hydrogen fuel cheap. We should also look into tapping into the methane under the solar ice caps before it is released into the atmosphere. Methane is 10 times worst than Co2 gases that contribute to global warming. I am still sticking with H2, the #1 element on Earth (the fragile planet).