As a consequence of global warming architecture has to cater for the cooling of our homes as well. The 1st option is to keep the heat outside. Isolation is key in this respect as well. Colors outside have a long tradition in protecting against heating up due to abundant sunshine. Doors and windows ask for additional protection as well. Historically, trees have been instrumental in providing shade for homes. Greening of facades is another natural option. For a long time homeshomes have been built above an underground floor or a cellar. Originally these naturally cool rooms served as storage rooms for food and drinks. Nowadays, such basements offer additional cool space during (exceptionally) hot summer days. The distribution of cool air from basements to upper floors is an alternative way of cooling, which uses little energy. For newly built homes this is another reason to drill builders drill. Even office space has been built in this way, much appreciated during the warm seasons. (Image: Paris UNESCO headquarters office space).