I'm surprised they didn't mention the NRL process...The NRL process begins by extracting carbon dioxide and hydrogen from seawater. As seawater passes through a specially built cell, it is subjected to a small electric current. This causes the seawater to exchange hydrogen ions produced at the anode with sodium ions. As a result, the seawater is acidified. Meanwhile, at the cathode, the water is reduced to hydrogen gas and sodium hydroxide is formed. The end product is hydrogen and carbon dioxide gas, and the sodium hydroxide is added to the leftover seawater to neutralize its acidity.

In the next step, the hydrogen and carbon dioxide are passed into a heated reaction chamber with an iron catalyst. The gases combine and form long-chained unsaturated hydrocarbons with methane as a by-product. The unsaturated hydrocarbons are then made to form longer hydrocarbon molecules containing six to nine carbon atoms using a nickel-supported catalyst, these are then converted into jet fuel.

NRL’s Material Science and Technology Division has received a patent for its Electrolytic Cation Exchange Module (E-CEM), which separates carbon dioxide and hydrogen from seawater and then producing hydrocarbons to be used as fuel.

http://www.dailymail.co.uk/sciencetech/article-2599036/The-plane-powered-WATER-US-Navy-reveals-radical-new-game-changing-process-power-jets-boats-seawater.html

The future is definitely not orange then.

6 and 1 are the only two viable options mentioned here. The rest are total crap. wind and solar are a joke. nuclear , hydroelectric damns. and surface wave generators are the only things we should be in vesting in.

Solar cells consist of plastic he says? Not very environment friendly.