Wind economics
What is the carbon payback period for a large wind farm, taking into account the energy and resources used for materials, manufacture and the construction of supporting infrastructure? If it is long, say 30 years, are they worth it?
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John Oxborrow, Coniston, Cumbria, UK
Seven litres a day
How does water hydrate us? If we drink a lot of it we only pass it as excess waste.
Stefan Badham, Portsmouth, Hampshire, UK
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