If you’re going to buy a boat, why not make it a green one as well? That’s what the ARKKI solar boat is all about – it comes with 153 square meter of interior space and 100 square meter of deck space, boasting solar panels to help it maintain uninterrupted power when cruising at speeds of 6 to 8 knots. Measuring 31.6 meters in length and 15.5 meters wide, this boat was made out of reinforced concrete and natural fiber composites, resulting in a stable and rigid form factor that ought to stand up to all four seasons without batting an eyelid.