What is montreol protocol?

it is the agreement that has sucessfully limited chemicals, eg CFCs, that destroy hign level ozone.

The Montreal Protocol is a treaty that was passed in 1988 and went into effect in 1989 that limited the production of and gradually phased out CFC%26#039;s (chloroflourocarbons) which destroy the ozone layer. CFC%26#039;s are (were) non-toxic chemicals used in refrigeration, industrial chemicals, and the manufacturing of styrofoam.

The treaty has undergone five revisions since this time to account for other chemicals and CFC alternatives that have been found to harm the ozone layer. It is hailed as a monumental treaty in terms of its success in bringing countries together to abate a serious environmental crisis.

The ozone hole remains a serious environmental concern, but the treaty was successful in severely limiting the production of CFC%26#039;s worldwide.