Eco-friendly traveling

Preston and Wade would like to make this trip as eco-friendly as possible - unfortuntely they don’t have a whole lot of money to work with!  If you have any idea or items you’d like to donate that would help their endeavor be more enviromentally friendly please leave us a comment!  We are especially interested in a vehicle that would allow for long distance traveling without the unpleasant side effects on the planet.   Any help or suggestions would be greatly appreciated - every little bit makes a difference!