Actually, they can't make cars that "run on water," sadly. It's not really feasible for several reasons, most importantly physics. The amount of energy require to break the water molecule into hydrogen and oxygen gas is three times the energy derived from igniting such gasses. It's a fun science experiment but was not effective in the long term, and is less efficient than even our electric cars.<quoted text>
I'm actually rooting for the version where we stop big oil companies from destroying every single alternative fuel that comes along, and just have energy that's not destructive to the planet.
We can make cars run on water, they done this successfully more than once, yet because big oil companies keep getting involved we're still thoughtlessly destroying our planet :(
Also, the "big oil company" thing you mentioned is, technically, a conspiracy theory, or as I call it, conspiracy nuttery. Oil companies make more money on plastics and textile production than anything, more factory new computers are sold every year than cars in a decade. Even with our technology recycling programs we use more virgin plastic on computers each year than any other product on the market, in the US and Europe at least. Oil companies also make no money off electricity production now, that's all coal, a different industry.
There are alternatives, the problem is that the lobbyists are all for their own pet corporations, all of them, even the "green" ones, all they want is to push for money into their corporations. One of the huge tax wasters is the raw material recycling companies now, I can go into detail if you want to change topics. But oil companies themselves don't even care about the fuel industry anymore, and while we're working on some great new bio-plastics, we will need the petroleum plastics for at least another century.