Translate the following English sentence to French:
"As early as last June the Commission financed a first study. It was carried out by the regional environment centre for central and eastern Europe and concluded that there had been no large-scale ecological catastrophe."
Dès le mois de juin, la Commission a financé une première étude menée par le centre régional pour l'environnement pour l'Europe centrale et orientale qui a conclu à l'inexistence de catastrophe écologique de grande ampleur.