Takuma is a tenure-track researcher at the National Institute for Environmental Studies (NIES), Japan, and an adjunct fellow at the University of Technology Sydney, Australia. He is currently a visiting research fellow at the University of Cambridge, United Kingdom. He received his PhD from the University of Tokyo in 2021, focusing on the global metal cycles in a zero-emission world. His PhD thesis won the Dean’s Award and he was the first in his department to earn the right to complete the PhD program in two years. He is currently leading several research projects funded by the Japan Society for the Promotion of Science and is a core researcher in the “Material Flow Innovation Research Program,” a five-year research project underway in the Material Cycles Division of the NIES.