Of course, the less waste you produce the more productive you are, but that's true across all factors of production, not just one in particular. You could become more efficient, if you want, in using one factor, but at the cost of becoming less efficient in the mix of factors for that kind of thing just as quickly. I think one by one is not an easy case.
In terms of greenhouse gas emissions, it's clear that Natural Resources Canada's office of energy efficiency has been tracking, for example, what the industrial sector has been doing, but in terms of energy efficiency. So you could look through that for measures that have been put in place by industry over a fairly long period of time now. From there, you can have a look at what their emission profiles would be as a result of that.