IF evidence were needed to illustrate how the protection of the environment is an ongoing struggle requiring constant vigilance, then campaigners should point to the recent warnings from the United Nations Environment Programme, (UNEP), about new threats to the ozone layer.

The Montreal Protocol, which limits the use of CFC's and other damaging chemicals, and is generally seen to be one of the more successful international agreements of its kind, is already at risk of being out of date, UNEP warns.

In a new paper, the ...

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