Habitable Designs embraces low-carbon building design (net carbon storage) in addition to energy-downsizing.  Net carbon storage can be achieved using construction materials with low-upfront embodied-carbon-emissions combined with an absence of high-upfront embodied-carbon-emission materials.  So-called biogenic construction materials exhibit low-upfront embodied-carbon- emissions because they pull CO2 from the atmosphere. That growth process creates negative emissions – thereby opening a new category of building materials characterized by carbon removal and storage.  This strategy can contribute significantly to carbon drawdown, with savings coming from avoided-CO2 emissions during construction and from avoided-CO2 emissions during subsequent house operations – a very effective way to sequester carbon.