Zero here.

We live in an apartment complex, therefore have no need for lawn mowers and the like. Then again, I'm guessing that yard service they use isn't cutting the grass with scissors.

We do use cars on occasion, renting for a weekend is usually our least expensive option since there are four of us. I'm pretty sure the food we buy doesn't magically appear at the store, and commercial agribusiness is far from getting high marks for energy conservation. We do have a spot in a community garden that we take full advantage of year-round. I guess we do what we can.