The long-term plan, in broad outline...

...is to go all-green eventually. Compost toidy for clean sapient emissions. For electricity, lots of solar cells and a wind jenny, maybe a towed impeller as well. Eventually ditch the diesel and go with a ~30hp electric motor, gang up a bunch of batteries, and presto! No fossil footprint at all, minimal chemical footprint as well. Then a desalinization device of some kind for fresh water at sea.