That's a very good point. It would vary by region. In some regions, the fuel mix is based on coal and in some regions it is based on hydro, so the benchmarks we would strive for would vary from region to region. That's correct.
One of the first steps would be to define what net zero building emissions would mean by region. We'd have to really establish the metrics. We're talking not only about net zero emission but also about low-carbon buildings. That means we need to define at what point a building would qualify as low carbon, because we have to move the industry slowly towards that goal. We are at about 50% energy efficiency, maybe 60%. We need to get to about 80% or 90% over time. It's really important to define the metric and then to move towards how that can be achieved.
We already have net zero buildings, but we want a larger number of those buildings.