Simple Green

What are the simple, affordable things that people can do to have a greener home? I can not say enogh times that buying existing homes is the best and easiest place to start if you are looking to change residences. No new energy is used in the transport of materials, the creation of those materials or moving people and equipment to construct them. It has already been used.
Add insulation if necessary. Seal ducts and replace old HVAC systems with EnergyStar rated equipment properly sized for the house. Don't forget to check the seals on thermal windows and get an energy expert to evaluate whether your windows are the most efficient for their location. If they are not, evaluate whether or not to change them. Think skylights and solar tubes to allow as much natural daylighting as possible. If you replace flooring use natural or recycled materials for your replacements.
Use native plants and fruit trees for landscaping. This will cut down the need for water use. Fruit trees will provide both shade and food. Think small and efficient. A small house can seem expansive when the space is efficient and open.
Honestly ecaluate wheter there is too little storage or you have too much stuff.