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Why you should drive slower and fill up less

The (UK) Telegraph has an article on the Vivace tidal / current power device I mentioned recently - Ocean currents can power the world, say scientists The technology can generate electricity in water flowing at a rate of less than one knot - about one mile an hour - meaning it could operate on most waterways and sea beds around the globe. Existing technologies which use water power, relying on the action of waves, tides or faster currents created by dams, are far more limited in where they can be used, and also cause greater obstructions when they are built in rivers or the sea. Turbines and water mills need an average current of five or six knots to operate efficiently, while most of the earth's currents are slower than three knots.

The technology can generate electricity in water flowing at a rate of less than one knot - about one mile an hour - meaning it could operate on most waterways and sea beds around the globe. Existing technologies which use water power, relying on the action of waves, tides or faster currents created by dams, are far more limited in where they can be used, and also cause greater obstructions when they are built in rivers or the sea. Turbines and water mills need an average current of five or six knots to operate efficiently, while most of the earth's currents are slower than three knots.

The 2008 figures are in from the new REN 21 Renewables Global Status Report: Renewable power capacity (excluding large hydropower) increased a hefty 16 percent last year, which is remarkable given that world oil use actually declined. Growth in some renewable sectors was even more impressive. Biodiesel production increased 34 percent, and solar power took the prize with a 73 percent jump. Renewable energy has not entirely escaped the impact of the global recession - growth this year will almost certainly be slower - but it is clear that global energy markets have turned a corner. Political support and business investment in new energy sources have reached the point where the new industries appear hard to stop. REN 21 reports that 64 nations now have policies to promote renewable power generation. Scientists, engineers, and entrepreneurs across the globe are responding with unprecedented innovation. Overnight, the energy business has begun to resemble the I.T. industry more than it does the energy industry of the past.