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David Brook wrote: > > Worldwide relience on wind turbines WILL dramatically affect world wide air > currents and hence weather patterns - even local balances could potentially > be upset. Removal of enough energy from the atmospheric currents to make a > significant contribution to world energy is bound to have an effect. This > would have a major climatic/environmental effect. I doubt it. Just calculate the energy in weather systems. > Tidal power and wave power likewise - you cannot extract energy without > affecting the balance of the original system. Tidal power is drawn from the orbital energy of the moon/earth system. I think the original barrier in France has a measurable impact on the earths rotations, but this is because we can measure time with incredible precision, not because a few million such barrier would make much difference. > Probably the best option is growing crops for burning - a 'renewable' which > doesn't seem to be much in vogue. It pushes up the price of arable land, and makes food more expensive, or destroys forest instead. There are reasons we don't all have a log fire to keep us warm in the winter given that at some point the UK was almost entirely forested (there were only a few tens of thousands of people in the UK then), this is the position we've effectively move from... > Whether man made co2 is an issue or not, I find it amazing that this is the > only greenhouse gas on which our great leaders are focussed - there are many > others - but they are probably less emotive Our political leaders are focused on methane, it is just the press that has a CO2 only attitude. However I think persuading the Orient to stop growing rice, or the West to stop eating beef, if going to be more challenging than the benefits produced by taxing aviation fuel. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html