For sure. Of course it would depend on the class of boat being raced. Small hydros, not much gas (but probably two cycle). Big offshore, more gas. That might also affect the size of the trucks as well (then they'd likely be diesel, not as much fuel but potentially worse emissions). The bigger boats would involve more materials for the build. I'm sure a large offshore racer goes through a good amount of fuel.

But the point was merely that if people are going to talk "green" it involves more than just the build (and sailing) of the boats. A point some will gladly make when the green argument is made...