Certainly with regard to oil and gas, the case is quite clear. With regard to other impacts, you have to look to the objective you're trying to achieve with that marine protected area. Certain things will not be compatible. Certainly, bottom trawling that impacts on the benthic environment is unlikely to be compatible in most MPAs, but you do have to look at each one to see what you're trying to achieve.
An example was given earlier of a shipping channel. If that shipping channel can be managed properly within an MPA and not impact on the objective of that MPA that it's trying to achieve, then it should be allowed to continue. If it cannot, then it's a different story.