Venice may be sinking into the ocean, but that's no excuse not to go green while there is still time. The city's port authority has announced it will build a power plant fueled entirely by algae to power its seaport. The algae will be cultivated in the plant, broken down into fuel, and the resulting carbon dioxide will be fed back into new algae, resulting in zero emissions. The plan almost sounds too good to be true. The extra energy from the process may "be supplied to ships docked at the harbor." Somewhere, Al Gore is smiling.