Seattle Post-Intelligencer: The number of Northwest cars and trucks bumper stickered with "Biodiesel: Mother Nature Approved" or "I love the smell of biodiesel in the morning" and even "Ethanol: No war required" has blossomed in recent years. But with growing fears over biofuels stealing from dinner plates to fill gas tanks, people are starting to wonder: How green are biofuels? The concerns are not only about traditional food crops such as corn being diverted to ethanol. …