Scientists uncover likely cheating on ozone treaty

The decline in the atmosphere of an ozone-depleting chemical banned by the Montreal Protocol has recently slowed by half, suggesting a serious violation of the 196-nation treaty, researchers revealed Wednesday.Measurements at remote sites -- including the government-run Mauna Loa Observatory in Hawaii -- of the chemical, known as CFC-11, point to East Asia as the source or renewed production."We show that the rate of decline of atmospheric CFC-11 was constant from 2002 to 2012, and then slowed b