Translate the following English sentence to French:
"It was at the Luxembourg Summit in November 1997 that we realised the importance of looking more closely into these phenomena so as to avoid suffering them again and to counter their negative consequences."
C' est au sommet de Luxembourg de novembre 1997 que l' on a pris conscience de l' importance de mieux étudier ces phénomènes pour ne plus avoir à les subir et pour contrecarrer leurs conséquences négatives.