First, insulate your loft and cavity walls. Second, buy diesel cars for 30 per cent extra mpg. Solar power by mirror-heating boilers is possible but still expensive.

Solar cells panels will pay when we can replace silicon with titanium dioxide - alias white paint - which is a quarter of the cost.

The simplest method with existing engineering is to build Prof Dan Zaslavsky's power towers at Timna in Israel - and the desert coasts of California, Chile, Australia and the Middle East.

These are steel cylinders 1,200 metres high and 400 metres across, into which seawater is sprayed at the top to cool, shrink and sink the air column, creating a round-the-clock gale to work ground level turbines.

Three at Timna and four north of Beersheba with more later can provide all the power and water - carbon free - for Israel's next century.

Frank Adam,
14 Hartley Avenue,
Prestwich,
Manchester.

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