Which protocol was signed to control the emission of ozone-depleting substances?AFrance ProtocolBGermany ProtocolCIndia ProtocolDMontreal ProtocolAnswer: D. Montreal Protocol Read Explanation: To control the emission of ozone-depleting substances an international treaty, known as the Montreal Protocol, was signed. It was signed in 1987 by more than 175 countries in Montreal (Canada). Read more in App