I am probably the farthest thing from an environmentalist you will ever see or speak to but even I have to acknowledge that things aren't what they should be. Yes the Governments exaggerate the nutsack off the issue and back up their arguments with "data" and "statistics" but its also been said and proven that we are coming out of an ice age. Both sides have this "irrefutable" proof that they are right and I think that, to a certain extent, both are right. Even the stupidest person you can find would agree that as we cut down trees, we are limiting the Earths ability to deal with carbon dioxide.
If we appropriated our carbon dioxide output to the amount of trees capable of processing that CO2, that solves the problem. But of course cities must expand, fuel is needed so its not going to happen. The only way I can see us getting out of it is by breaking the fist law of thermodynamics: Energy cannot be created or destroyed, it can only be converted to one form and another.
Case in point: Two stroke engines. In the combustion cycle, you get the explosion that drives the piston back down. But touch your engine when its running! Its warm or hot isn't it? Thats energy from the explosion being sent into the cylinder and cases as heat energy. And the sound? Energy. In theory you could run one motorcycle forever from just one combustion cycle if you found a way to recapture and reuse every single ounce of energy.
Theres other options of course: bio energy (Which will still release a certain amount of CO2) batteries (which need to be charged at some point or another) etc.
At any rate, I doubt the governments will let our world die no matter how stupid they seem at times. In the mean time, I'll keep riding my two stroke.
Oh and if we can break the first law and we can create energy then we can also travel at theoretically infinite speeds, just a thought.