I think a starting point, actually, are the major projects identified by the Major Projects Management Office. If it's big enough to be of interest to MPMO, then there probably should be a serious environmental assessment done, either a comp study or a panel review.
That just gives you a flavour for it. It's not so easy to say what a major project is; it has to be with dynamics or an iterative process, because new things are coming up all the time. Ten years ago, we didn't worry so much about wind farm projects. Now that's one of the biggest issues we have.