Goin' Green Apple

Two years ago, I never would have considered myself an environmentalist. I took long showers, threw most everything in the trash and found fuel efficiency to be secondary to speed. Now I haven't given up red meet or bought a Terra Pass, but I do make a more conscious effort to be good to my planet. Since I have moved to New York City, I ride public transit almost 95% of the time, recycle half of my trash and have shortened my showers. All small steps to lessen my impact. But, is there more I can do?