One thing we can do to reduce impact is to be producers, not just consumers. The Grow Foods Not Lawns movement is one such idea. You can join their FB group and see great ideas in how to maximize your food production within the confines of urban and suburban spaces. This article:
gives ideas about using raised garden beds (often made from sustainable and recyclable materials) to be more productive in your home garden.
RealFarmacy also gives great tips for composting, chickens and more