[toecutter]

Well the comment you replied to that you agree with "100%" also said wave energy + tidal energy.

Your method of analysis is assuming we exist in the best of all possible worlds. "Flying machines have been tried time and again" is valid right until wright brothers. "Electric cars have been tried time and again" right before Tesla enters the market.

It's one thing to say "roof top wind" and you can look at the loads an average roof can support, realize it will be a small swept area at a low elevation and conclude that roof top wind couldn't power the building its mounted on. There is no way to write off tidal with the same sort of first principles analysis, the power is there, its a matter of design whether or not it can be captured efficiently.

[jacquesm]

Electric cars were proven to be viable in the early 1900's. We've had electric vehicles in one form or another in all that time since then.