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In my opinion all so called renewables are flawed. As with all human behaviour, there are no problems with any small scale developments - but - if they become the norm and widescale, they will have their own impact on the natural cycles. For example :- 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. Tidal power and wave power likewise - you cannot extract energy without affecting the balance of the original system. As a beliver in 'the butterfly theory', and having a little knowledge of so called 'chaos theory' - the final outcomes of mass development of these technologies is unable to be modelled and hence uncertain. Probably the best option is growing crops for burning - a 'renewable' which doesn't seem to be much in vogue. The concept of closed Carbon Cycles has to be a good one plus of course it gives the farmers something to do!! 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 Cheers David -- 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