Noxious gases.

Im not certain which ones can be managed best to be honest. But water driven vehicles I would think would be somewhat easier than LPG, petrol or diesel.

Anyway there are plenty of alternatives we could invest into aside from going back to walking or rowing medicine to 3rd world countries was my point.

Electro magnetic machinery is another that may come into its own, solar power combinations of both that and magnetic was once used.

We could even end up with a new band called DC/AC, instead of AC/DC

Probably was the better way to go for energy storage.

Turning air to helium is an ancient one that may arise again for our betterment, if we dont fuck everything up first and end up in a dust bowl.

Another trouble is investment, if all super funds and the like are invested into alternates instead of fossil fuels they will no longer support the all the other sub businesses that mining and the likes create and the economical structures that exist will suffer thats the main reason so many politicians on your side of the argument stand up for the way we are heading and they'll pay scientists to find in their favour just as the other side pays scientists to find in theirs.

On another note yesterday Nasa stated they were about to release info that would change world perspective. I woke up looked at their site this morning and its been taken down due to lack of governments funds. WTF? I dont believe that, it isnt a new rocket program its just a fucking web site its not even April the first wtf?