1. Department of Economics; University of Pretoria; Pretoria South Africa
2. Centre d’Ecologie Fonctionnelle et Evolutive (CEFE/CNRS-UMR 5175); Montpellier France
3. Missouri Botanical Garden; St. Louis Missouri
4. School of Public Leadership; Economics and Management Sciences Faculty; Stellenbosch University; Stellenbosch South Africa
5. De Wit Sustainable Options; Brackenfell South Africa