Environmental risk assessment in coal mining with methane degassing Gregorio Fidalgo-Valverde, Agustín Menéndez-Díaz, Alicja Krzemień, Pedro Riesgo-Fernández and Antonio Luis Marqués Sierra MATEC Web Conf., 389 (2024) 00039 Published online: 10 January 2024 DOI: 10.1051/matecconf/202438900039