Sustainable charcoal production from rubber tree branches (Hevea brasiliensis) Suriyan Sairod, Prayut Jiamrittiwong and Nutdechatorn Puangngernmak E3S Web Conf., 610 (2025) 03001 Published online: 23 January 2025 DOI: 10.1051/e3sconf/202561003001