There is an increasing housing demand in developing countries. This demand is like a train coming very quickly towards humanity. We need not delay in laying down the sustainable train tracks, before the effects of climate change devastate as all. However green homes can not be implemented in isolation, but require a holistic approach that incorporates lifestyle activities, local materials and consuming lower down the food chain. Therefore with the presence of an informal sector, solutions could be established by drawing lessons from green rated homes, troglodyte dwellings, earthships, autonomous houses vernacular dwellings both in developed and developing countries, with bottom-up and top-bottom approaches on a case by case basis bearing in mind local relief and climate.