Cruising across the open seas may seem like a great way to get close to nature, but take a look at the sheer quantity of fuel most boats suck down as they power through waves (and manatees) and you'll realize the truth. Thus a new breed of eco-friendly boat has arisen, the latest entry being San Francisco's Alcatraz Cruises Hornblower Hybrid ferry. The ship, which will take passengers on trips to the Rock and elsewhere in the Bay, uses two vertical wind turbines and a solar panel to power its on-board electronics, with any excess juice going to the boat's propulsion systems -- which still rely mostly on diesel to get the craft and its
