It is true that riding a four stroke dirtbike has environmental impact, much like everything we do in life. I am comfortable with that impact, enough said.
I'm not, you asked for feedback on your endeavor, you got mine: I don't think that Dirt Bikes and kayaking mix for the reasons stated. You got defensive so I used your own, admittedly plastic corp mission as ammo, which made you even more defensive.
If my answers to your questions disturb you, perhaps you should cease asking questions.