We're looking at it in terms of the impact on the environment of using high-speed versus.... For example, as we all know, the automobile has become very efficient. The emissions it now emits, compared with those from automobiles 15 years ago, are very different.
This has been a challenge every time we look at passenger rail. Passenger rail is very environmentally friendly when you have large numbers of people, because rail is more environmentally friendly than the other modes, but you need the people on it. When we're looking at this, we need to keep in mind what kind of energy would be used for this service. If it's electricity, does it exist? Do we have it? What's the impact of the emissions from that versus continuing to use the automobile, versus continuing to use more planes, or even buses? That is part of the benefit-cost analysis of the impact on the environment.
As well, there is the physical environment, because depending on the routing, we again could be impacting the physical environment through the location of the service.