António Guterres The secretary-general of the United Nations visit Chulalongkorn University Centenary Park features innovative measures to mitigate climate change including green roofs, water retention tanks and wetlands. While serving as a green space for public use Published caption :  United Nations secretary-general António Guterres visits Chulalongkorn University Centenary Park which features innovative measures to mitigate climate change including green roofs, water retention tanks and wetlands while serving as a green space for public use.