It seems odd that I could lurk for months reading about boat systems and seamanship, but a physics misconception brings me out into the light. To wit:
Quote:
Originally Posted by Hampus  Hydrogen is recognised as the cleanest fuel that you could possibly run a combustion engine on and it produces no green house gases whatsoever. |
Combustion of hydrogen is very clean, but it does indeed produce greenhouse gases. It's not very well publicized, but water vapor is in fact the primary greenhouse gas on Earth. It is the most abundant of the greenhouse gases, and has by far the greatest contribution to the greenhouse effect.
Most climate-change activists are focused on carbon-based greenhouse gases (e.g. CO2, hydrocarbons), and ignore water vapor altogether. Some say that this is because there's very little that can be done to keep the sun from evaporating the Earth's oceans. Others say that it's because you can't tax the sun or the oceans, so politicians and regulators can't be bothered. Still others say that carbon-based industries have been demonized for decades, and that the climate change crisis is just the most recent tactic to be used against them.
Which reason you believe is probably a function of your level of cynicism and your position in the public/private/nonprofit sphere.
On the original topic: I'll never forget my high-school chemistry teacher trying to explain to us that you couldn't burn water because it had already been burned. Took a while for that one to sink in.