I would love to be able to deserve a 4, but I don't think I'm there yet. Much of the 'green' that I do is built-in, so I don't have to think about it much.
We put radiant barrier in the rafters of the house. Extra insulation. I have a converter on my heat pump that heats my hot water all summer long from the heat pump, so I basically get free hot water from April - October when the air conditioning is on. Upgraded variable speed air handler. We painted the house a very light gray and put on a white roof (that's the best in Florida). All of my lights are on dimmer switches, yes even fluorescents with special ballasts (I haven't had to change a light bulb in 5 years). Ceiling fans are everywhere to reduce air conditioning. We keep the air set to 82 in the summer. Low-flow shower and toilets. Cork flooring (insulating, pest resistant, non-allergenic, joint friendly, environmentally better than wood or ceramic). Florida-friendly landscaping.
We have a compost bin and I have a compost collector in the kitchen. We use a rain barrel for garden water. We grow our own citrus fruit, herbs and some vegetables. We recycle glass, plastic, paper, metal and yard waste.
We try to buy as little packaging as possible and always use cloth shopping bags, not just for groceries, even at the Mall.
I try to cook almost everything from scratch and avoid foods with additives and preservatives.
WHEW!!!!! I'm making myself tired! But there's so much more we could do, and when I start doing more, I'll earn my 4.