Who is this city's most fierce, forward-forging green advocate? The answer is blowing in the wind. This year, Marilyn Megenity -- who infuses her Mercury Cafe with good, organic food and intelligent entertainment and fuels her own car with vegetable-oil fuel -- took out a loan on her home so she could install two forty-foot-tall Air X turbines on the roof of the Merc's longtime home in downtown Denver. Though Megenity's quixotic installation (which is small in comparison to those that whir out on the prairie) isn't big enough to completely cover the restaurant's energy-consumption needs, the windmills do something else just as important: They set an example for the rest of us.