The cause of the crisis is a knotty one. Almost all the world's supplies of helium come from a handful of industrial plants in the US which have been undergoing maintenance. Most of the natural resources are hard to get to, and demands from the science, medical and technology sectors mean the fate of the humble balloon is up in the air. Balloon shops supplying children's parties and weddings in the UK complain of price rises of up to 20 per cent for helium, plus increases in additional surcharges, delivery costs and...
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