Dr Rozzeta Dolah faces high barriers in her journey towards producing sustainable aviation fuel, but these challenges have spurred her to commercialise climate-friendly solutions to support Malaysia's decarbonisation push.
From digital neighbourhood maps in Nairobi's Kibera slum that allow residents to point out service gaps, crimes and accidents, to Korea's "green cards", mayors serve as vanguards of sustainability with these 15 city-driven innovations.