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On 30th of June this year, a study was released in one of the world's top scientific journals. It explained how a group of scientists who'd had been measuring the amount of ozone in the stratosphere had made a startling observation: the hole in the ozone layer had shrunk. Here, they said, was the first, clear evidence that the ozone layer had begun to heal. So how did this happen? It's a story that involves dogged scientific endeavour, the burgeoning green movement of the 1980s and the signing of what has been described as the most successful treaty ever created. [Source: The Inquiry _ BBC]
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