I was raised by very "green" parents. My Dh has the same inclination. Our main emphasis lately has been on lower power usage. DH chose our heating/cooling system to be as efficient as possible. Insulation is a big emphasis around here. most of our lights are LEDs. For 4-6 watts, we get 60-100 watts worth of high color temperature light. The refer is very high efficiency. We also use cloth grocery bags, which have the added advantage that they hold more without shredding. We have recently downsized our abode, which also helps. Not only did we get several thousand for our yard sale stuff, lots of stuff went to the local thrift store.
Our LQS has a regular recycle deal, if you bring in a bag for your purchases, you are entered in a monthly drawing for a $20 gift certificate. I've won it twice in the last couple of years.
Of course, the most interesting Green activity in my life is crumb quilting.