He haurehu ka puta i te moī me te pōpopo hāora-kore o te pararopi. Ko te mewaro (CH4) me te hauhā (CO2) ngā wāhanga matua o te haurehu koiora. Ka puta māori mai i ngā whenua kūkūwai, he huataha anō hoki o te ruapara. Ka whakatūria he pūnakunaku hāora-kore ki te pāmu miraka kau, ki te taupuni parakaingaki, ki ētahi atu wāhi hoki, ā, ka whāngaihia atu te hamuti kau, te parakaingaki, te para kai, me ngā hua tipu (pēnei i te kānga me te karapēpē) hei whakaputa haurehu koiora. Ka hopukina te haurehu nei, ā, ka tahuna hei kora, hei puna pūngao whaihua.
Biogas is produced from organic matter breaking down without oxygen (anaerobically). It primarily consists of methane and carbon dioxide. It occurs naturally in wetlands and is a byproduct of landfills. It is intentionally produced in anaerobic digesters at farms, wastewater treatment plants, and dedicated facilities, using cow manure, sewage, food waste, and agricultural crops (such as maize and silage). It is captured and can then be burned as a fuel.
I ētahi pāmu kau nui, kua whakatūria he pūnakunaku hāora-kore, koia e huri ai i te hamuti kau hei haurehu koiora, hei puna pūngao anō hoki mō te pāmu.
He haurehu kati mahana te haurehu koiora, nō reira ki te kore e hopukina, ka kino kē atu te mahana haere o te ao.