Translate the following English sentence to French:
"Firstly, we have stipulated that 25% of all commercial shipping will in fact be obliged to undergo inspection, in order to ensure that waste disposal is being carried out in accordance with the regulations. MARPOL is all well and good but not when it stays on the bookshelf!"
Car, primo, nous avons établi que 25 % des navires marchands doivent faire l'objet d'un contrôle relatif au traitement correct des déchets : la convention MARPOL est un bel instrument si elle ne demeure pas sur les rayonnages d'une bibliothèque.