Photo taken on July 16, 2018 shows the interior of an Ecological living module, a 22-square-meter "tiny house", at the United Nations headquarters in New York. Developed by UN Environment and Yale University in collaboration with UN Habitat, the new eco-housing module is made to spark public discussion and new ideas on how sustainable design can provide decent, affordable housing while limiting the overuse of natural resources and climate change. (Xinhua/Li Muzi)