Good eco-news always catches me by surprise, I guess because I so rarely get any of it.
This is really neat: the owners of Maui Recycling have opened a biodiesel car-rental agency on Maui and Oahu. You can rent a new diesel VW Beetle or Golf and burn pure recycled vegetable oil (B100 biodiesel).
There are only one or two B100 fueling stations on each island, but I think it would be hard to use up a full tank of gas within a week on the island. I mean, driving 500 miles in a week is something you go to Maui to stop.