What are my next steps to becoming greeeener?

I currently recycle nearly all of my paper, cardboard, plastic, gl, and aluminum cans. I am in the process of updating all of my light bulbs to CFL's. I try to be conscious of packaging and logistics when I shop for groceries, etc. I've switched to bringing my own canvas bags to grocers instead of using plastics, and I try to use common sense about conserving electric, gas and water around my home. What are the next steps I can take to reduce my impact?