I'm going to turn to Malcolm in a minute because he's the expert, as the engineer.
Scope 3 is more challenging than the other emissions because you often need to develop methodologies to be able to assess them. The easiest one for us to do is travel and we've been reporting that since 2018, I think.
The next one was trickier. Malcolm can describe the international group of experts we put together to help, but it was procurement. That one we have now been publishing since February.
The third one that we're tackling is commuting costs. That's a study with U of O and some others. It's an area where the methodologies have to be sound.
Malcolm, maybe you can describe where we are on this and what's next.