Cristina Trois, Ph.D., is a Professor of Environmental Engineering and the Director of the Centre for Renewable and Sustainable Energy Studies at Stellenbosch University, in South Africa. Before that, she was the DSTI/NRF South African Research Chair in Waste and Climate Change (SARCHI) at the University of KwaZulu-Natal (UKZN), former Dean and Head of the School of Engineering also at UKZN. She holds an MScEng (summa cum laude) and a Ph.D. in Environmental Engineering from the Department of Geo-Engineering and Environmental Technology of Cagliari University, Italy. Professor Trois is a C1-rated scientist with the National Research Foundation. Her main fields of expertise are environmental and geo-engineering, waste and climate change in sustainable cities, waste and resources management, control, management and treatment of landfill emissions, renewable energy from waste, biomass energy, greenhouse gas control from zero waste in Africa and developing countries and the circular economy. Professor Trois is the developer of the waste management decision support tool/model: WROSE. She is editor of Springer’s Waste as a Resource book series and co-editor of the book Waste Management in Developing Countries (Springer, 2022). She is the author of over 130 publications in high-impact journals and has successfully supervised more than 100 Ph.D. and Master’s students. Professor Trois is the Chair of the joint secretariat for the Southern Africa Region of the UN-IPLA Programme (International Partnership for advancing waste management services of local authorities) and the IWWG (International Waste Working Group) and is a Fellow of the South African Academy of Engineers and Academy of Science. .