This is a brief review of last week’s intro. More energy is used in buildings than is consumed by vehicles. I don’t mean to say avoid the transportation issue because it’s a close 2nd to buildings. The easiest solution to both these things is less. Fewer miles driven and smaller homes. Then small, efficient, clean systems and cars can supply our energy and transportation needs. If we make the shell of a building like a thermos we can greatly reduce the energy used for heating and cooling. In our northern NM climate, cooling becomes unnecessary in a well insulated house or even an un-insulated adobe. Just opening and closing a few windows, night and day can provide fresh air and a cool comfortable space.