"Right across the road from the town cemetery in Sweetwater, Texas, sits another graveyard where the dead are never buried. Some 4,000 worn-out giant wind turbine blades are piled as far as the eye can see, taking up most of a 25-acre field.

Windmill blades can be longer than a Boeing 747 wing – more than 300ft – and weigh up to eight tons, so these have been sawn into three pieces with a diamond-encrusted industrial saw. They’re still imposingly big, although now increasingly covered in weeds.

They’ve been here for five years and, given a recycling company’s failure so far to deal with them, are almost certain to remain for many more – an unsightly monument to ‘clean’ energy’s dirty little secret.

Hailed by the green lobby as one of the most under-used renewable energy sources, carbon-free wind power is on the rise.

The enormous white windmills are sprouting on land and off coastlines in ever-greater numbers, including in Britain, which is building the world’s biggest offshore wind farm in the North Sea.

But they come with a hidden environmental cost that is rarely mentioned: they don’t last for ever: only 20 to 25 years, in fact. And the blades, built from a ‘composite’ of fibreglass and resin that can withstand hurricane-force winds but be light enough to turn, cannot easily be crushed, let alone recycled."