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This week at TreeHugger: The latest TreeHuggerTV features an open-source, grassroots plug-in Prius conversion in action. To celebrate World Environment Day, Honda offers its customers organic chocolate with some carbon offsets to wash it down. Ultra low sulfur diesel has has arrived in the U.S., but that's no match for the combination of the two greatest forces on earth: celebrities and biodiesel, and we have a rundown of whose using. East Coast hybrid drivers will find they get a discount when they pull into a Kimpton hotel for the night. And more ways to make the cars we drive work better and use less gas.

[TreeHugger's Perspective Shift roundup appears every Wednesday]