Yeah read up on him man. Tesla, the dude had it all figured out. He even started to build a free energy machine in NY. Then they discredited him, bankrupted him, and eventually had him whacked! ha
I think I heard about the methane thing too. Apparently there's tons of it dissoved in the oceans. They are actually worried about it releasing into the atmosphere because methane is like 20x more potent a greenhouse gas than CO2. There is a lake in Africa, I forget the name but it is saturated with dissolved co2. Once in the 80's something released all the co2 at once and it killed 1000s of people nearby. If we could get the methane out of the ocean maybe we would be averting a natural disaster as well!
Although methane is a hydrocarbon so burning it is going to produce co2 no matter what. It's basically natural gas, still alot cleaner than gasoline. Even squeaky clean hydrogen - if it's burned in a pure oxygen atmosphere produces nothing but water vapor, but for real world uses burning it in regular air creates oxides of nitrogen from the nitrogen in the air and other impurities.
Moral of the story, burning anything is bad in the long term. We gotta put our thinking caps on and get way out past that for the future.