I think to be a Green doesn't mean you have to be a zealot or a demonstrating fanatic about it. If you have respect for the environment, recycle, don't litter and generally avoid polluting you can legitimately be called a Green.
But even motorists subscribe to this to a certain extent so they can be Green also. As bicyclists we are more so because we contaminate the air and the roadsides less.
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ljbike