Even before the advent of modern sciences, people in tropical and sub-tropical areas have used limestone powder to pain their homes just two months before the start of summers. People used to excavate limestones, then put them through kiln to produce quicklime. These methods have been known for ages in such areas, even before modern Chemistry.<p>It is time to study how people survived in tropical areas, what kind of houses they built, how they cooled their homes, what kind of trees they used for shading, etc. And use modern science to better understand the traditional methods, then refine and/or find better alternatives. Instead of this, the governments, the research institutes, and the builders in the tropical areas, just build concrete jungles, thereby making homes as heat domes.