Step 5Use Environmentally Friendly Cleaners
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Geothermal is excellent but do you mean 'Geothermal' or do you mean 'ground source' heat pumps? We did a study ( i work for an architect specialising in zero carbon buildings) that ground source heat pumps are less efficient than just using gas to heat the home when it comes to carbon release and energy consumed. As most people are attached to the grid the loss in transmission means that although you get a great coefficient in the home you get a really poor coefficient overall. We then found that (in the UK) roof sizes were not large enough to support enough solar panels to power the pumps 24/7 and still provide enough enery for the rest of the domestic load.
We found solar thermal for hotwater backed up with a small amount of biomass, and super insulated airtight buildings to be the best solution.
If you are interested we wrote a book 'the ZEDbook' all about it - its available through RIBA books.
good instructable keep spreading the word.