Potent greenhouse gas used in Nike trainers
The most powerful of all greenhouse gases, sulphur hexafluoride, is being used by the world's biggest producer of sports footwear, Nike, as a cushioning agent in the soles of some of its training shoes. Its main competitor, Reebok, makes trainers which use only air as the cushioning agent, but other manufacturers could follow Nike's lead when its patent expires later this year.
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