The idea of 45th World Congress on Waste Management, Bioenergy and Biofuels: A Greener Future (WMBB-25) scheduled on Aug. 11-13, 2025 Barcelona (Spain) is for the researchers, scientists, scholars, engineers and parctitioners from all around the world to present and share ongoing research activities. This conference provides opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration.