I could think of a variety of means to beef up the cumulative environmental assessment analysis. First of all, there are some guidelines and policies to provide guidance to practitioners that could be reviewed and probably improved in terms of what we're really looking for.
As well, a number of observers and EA practitioners have recommended that perhaps, at least with respect to smaller projects, the best way to look at cumulative environmental effects is to conduct regional-level assessments of various types of programs and try to get at the issue that way, rather than put the burden on proponents of individual projects or the responsible authorities to try to do it on a case-by-case basis.