FILE PHOTO: Zhang Tieliang 76, sifts through dunes of low-grade coal near a coal mine in Ruzhou, Henan province, China November 4, 2021. REUTERS/Aly Song
FILE PHOTO: Zhang Tieliang 76, sifts through dunes of low-grade coal near a coal mine in Ruzhou, Henan province, China November 4, 2021. REUTERS/Aly Song