council decis decemb conclus amend montreal protocol substanc deplet ozon layer adopt june london parti protocol eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament regard opinion econom social committe establish continu emiss ozon deplet substanc current level signific damag ozon layer intern consensu signific reduct product consumpt substanc decis eec eec provid control limit effect cover substanc cfc cfc commun member state sign vienna convent protect ozon layer hereinaft refer vienna convent protocol supplementari vienna convent montreal protocol substanc deplet ozon layer hereinaft refer montreal protocol negoti adopt septemb protocol sign commun member state commun view respons environ trade approv decis eec vienna convent montreal protocol recent scientif evid adequ protect ozon layer higher degre control chlorofluorocarbon halon requir provid montreal protocol evid addit control fulli halogen chlorofluorocarbon carbon tetrachlorid trichloroethan amend adjust montreal protocol implement control adopt london june amend approv protect promot improv environ bring forc amend montreal protocol base principl prevent action avoid damag ozon layer scientif technic data time adopt end commun approv amend commun approv amend montreal protocol provis carri commun member state approv order oblig amend appropri carri member state approv member state conclud rapidli procedur ratif amend view permit deposit simultan instrument approv accept ratif commun member state adopt decis articl amend montreal protocol substanc deplet ozon layer approv behalf commun text amend attach decis origin arab chines english french russian spanish text equal authent articl presid council deposit act approv amend montreal protocol behalf commun secretari gener unit nation accord articl vienna convent read conjunct articl amend montreal protocol articl member state step permit deposit simultan decemb instrument ratif accept approv amend montreal protocol commun member state member state inform commiss decemb decis ratifi prospect date final ratif procedur commiss cooper member state arrang commun member state readi date simultan deposit instrument decemb articl decis address member state brussel decemb councilth presidentj alder oj oj oj oj oj oj