In the 1970s, the ozone layer began depleting. CFCs typically found in spray cans, fridges, and air conditioners, were thought to be causing it. In 1985, scientists found a hole in the layer. Two years later, in 1987, 46 countries such signed an agreement to phase out the chemicals. A report-produced by UN, US and EU agencies says the agreement is working. "It says that, if current policies are maintained, the ozone layer will be restored to 1980 values.