They were segregated and had hard times finding jobs and when they did manage to get them, it was mostly low-skilled low-paying physical jobs like carrying bags of cement or loading ships in the docks. When the great depression came, they lost even this because white workers were prepared to do even those jobs so they lost even the little wage that they had.
There are benefits of green buildings and they have convinced many architects and construction companies to “go green” since taking that choice the companies protect the environment, save money, reduce pollution, and increase human health and happiness. Green building is a trend that is here to stay.