Translate the following English sentence to French:
"Let us recall for a moment that the central objective of the OSPAR Convention is to reduce marine pollution to close to zero and to historic levels by the year 2020."
Rappelons que l'objectif premier de la convention OSPAR est de ramener la pollution marine à des niveaux proches de zéro et à des niveaux historiques, d'ici l'an 2020.