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It's an incredibly destructive greenhouse gas, that can seriously damage the atmosphere. Sulphur Hexa-fluoride, also known as SF6, is used to prevent fires and accidents in electrical equipment, in power stations and wind turbines. But if it leaks the consequences for the environment are severe, and levels of SF6 in the atmosphere have increased sharply in recent years. Across the EU leaks have been equivalent to the emissions of 1.3 million extra vehicles on the road in just one year. Matt McGrath now investigates, what's behind the rise.