In Natural Born Killers, Woody Harrelson played a mass murderer on a road trip killing spree. In Go Further, Harrelson has returned to the road, this time as himself, and this time he’s out to save the earth. The film documents a trip down the Pacific coast Harrelson and assorted friends took in the summer of 2001 in a bio-diesel and hemp oil-fueled bus. Along the way they tack...