It is one of mankind’s most daring experiments – a quest to produce virtually limitless clean energy that, if successful, would revolutionise life on Earth by harnessing the explosive power of the sun.

The energy problems that already beset our species, and look certain to dominate the future, would be wiped out at a stroke. The pollution of fossil fuels would be a thing of the past. The oil beneath the Gulf of Mexico could remain, safely unmolested.

Such is the appeal of the idea that the greatest powers of the world, China, India, Japan, South Korea, Russia, America and the nations of the European Union, have united to pursue the same stellar objective. Their aim is commercially viable nuclear fusion – deriving energy from crushing together the nuclei in atoms rather than splitting them, as is done currently in nuclear fission reactors.

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