Human activities like deforestation, overpopulation, waste production, pollution and overuse of natural resources are negatively impacting the environment. Key factors of environmental degradation include deforestation for fuel, livestock or commodities which removes forests; overpopulation exceeding the carrying capacity of regions; and waste such as household trash, hazardous, medical and industrial waste. Pollution from fossil fuel use and agriculture introduces harmful substances into the air, water and land. Energy production from sources like coal mining, oil drilling and reservoirs also damages the environment, as does over-extraction of natural resources through mining, fishing and logging without concern for conservation and sustainability.