Have you joined a car-share program? Hung your laundry out to dry on a clothesline? Started riding your bike on short trips (or all the way to work)? Set up a community recycling effort? Switched from air conditioning to a fan?
Inspire others with your actions to curb carbon emissions by taking a photo of your small (or big!) step and uploading it to the Sierra Club's Every Day Solutions site. If you're fresh out of green ideas, check out what other folks are already doing.