NIGERIA'S President Muhammadu Buhari is about to take over the presidency of the Pan-African Agency of the Great Green Wall – the continent’s effort to restore degraded cropland, grazing areas and woodlands bordering the Sahara Desert. He takes over from Mohamed Ould Ghazouani, president of Mauritania. LARS LAESTADIUS, Adjunct Research Scientist, Swedish University of Agricultural Sciences CHRIS REIJ, Sustainable land management specialist, World Resources Institute DENNIS GARRITY, Board Chair, Global EverGreening Alliance & Distinguished Senior Fellow, World Agroforestry (ICRAF), World Agroforestry (ICRAF) Buhari has the support of the United Nations Convention to Combat Desertification and an international accelerator platform with…