Angolan President Joao Lourenco (L) greets UN Secretary-General Antonio Guterres (R) during the 9th Tokyo International Conference on African Development in Japan. Africa has everything it takes to become a "renewable superpower," UN head Antonio Guterres said Thursday, as he called for greater investment in green energy across the resource-rich continent. Guterres spoke at a three-day development conference in Japan attended by African leaders, where Toky