I'd say shoot for the top.

Avoid the petty badges, truck guards and functionaries with a bit of low-level power.
Their goal will be to always keep control over their turf and avoid any heat from their superiors. Understanding is not in their vocabulary - "NO!" is, as you've learned.

Flatly put, they haven't been actually told that it is "okay" for you to ride in - - so it isn't. They call this singular blindness, "just doing our job," and its hard to argue with that, these days. I work with security folks everyday and see it continuously.

Continuing with them is a waste of time... so do something different.

Contact the Airport Director, instead. If you have a chain of command that must be adhered to, then start there as you must. But plant to go the top. If you only "work there" in some service position, a mechanic etc., don't waste your time with protocol.
Airport security is FAR more stringent than it used to be, so beating against their wall is most likely a waste.

Go the person who has the time to hear a well thought out plan, from a clear headed individual who understands all sides... and who has the power to act on your behalf above the security wogs. Plead your case to that person.**

** This is a pretty good place to start:

Call Transportation Secretary Lahoods office and complain.
http://www.cbsnews.com/stories/2010/...n6394904.shtml

PS And as for the airport being Eco-Green, that is a federal mandate and a public relations gig. The only person who may care about that at the individual level IS someone near the top...