When you glide into the marina with your twin internal-combustion power plants growling oh so sweetly and softly, are you greeted by placard-bearing tree huggers looking to put you on their bad-boy list? Not to worry. Just pull out a few of your carbon-offsetting, solar-powered goodies and show them you care. Don’t have any? Here is a baker’s dozen solar marine accessories you should check out. They rank among the growing array of products designed to make boating more “correct” and compatible with the long-term goal of reducing carbon emissions — come to think of it, not a bad goal.