Cleaner, greener, safer?

I scratched my head and began:

A Boris Johnson hallmark soundbite is that he'll make London safer, cleaner and greener. It doesn't refer only to transport issues, but if his polices in that realm fail to match up to his key pledge, then he'll have failed by his own measure in the department where he wields his greatest powers. The signs aren't looking good.

Then I carried on.