The Montreal Protocol refers to:

Options

A. persistent organic pollutants
B. global warming and climate change
C. substances that deplete the ozone layer
D. biosafety of genetically modified organisms

Answer

c

Explanation

The montreal protocol an substances that deplete the ozone layer was signed in Monteral. Canda, by over 150 countries at convertion in 1987 to cut use of CFCs (chlorofluorocarbons). The aim of the Protocoal was to protect the ozone layer in the stratosphere by decreasing and the eventually eliminating the use of ozone-depleting substances like CFCs. It is regarded as one of the most successful international treaties in modern history.