Diesel is king right now. There is a host of propulsion systems being looked at, but by no means is this anywhere close to being ready for the road or ready to replace diesel. Again, we are doing everything we can from an industry perspective in supporting that research and trying everything.
There's no silver bullet in alternative propulsion right now, but again, we're supportive of that. As good corporate citizens, we want to do the right thing for the environment and lower our carbon footprint, our GHG emissions, but right now the technology just isn't there. We're going to need more time to figure this out, hence our concern with the rationale for the carbon tax.