translate English to French: Since the Montreal Protocol, a number of subsequent meetings have been held where additional requirements have been added to the Protocol through amendments adopted in London (1990), Copenhagen (1992), Montreal (1997) and Beijing (1999).
Depuis le Protocole de MontrÃ©al, plusieurs rÃ©unions ont eu lieu et des exigences supplÃ©mentaires ont Ã©tÃ© ajoutÃ©es au protocole par des modifications adoptÃ©es Ã Londres (1990), Copenhague (1992), MontrÃ©al (1997) et Beijing (1999).