https://www.sail-world.com/Australia/Guardian-S-Class-the-worlds-first-Carbon-Neutral-Speed-Boat/-75954?source=google
https://oceanshaker.com/2010/10/22/the-guardian-s-class-tender-concept-by-sauter-carbon-offset-design/
https://www.charterworld.com/news/worlds-carbon-neutral-speed-boat-guardian-class-sauter-carbon-offset-design/guardian-s-class-tender-the-worlds-first-carbon-neutral-speed-boat-image-credit-sautercarbonoffsetdesign-com-2