| Substituting LPG with more efficient and cheaper fuels such as biogas of firewood can minimise the escalating costs. |
| Plant growers tell me that yields for biogas plants can be doubled on good acreage with traditional plant cultivation. |
| These digesters help prevent deforestation, since biogas rather than wood is used for cooking. |
| A part of the biogas is CO2, which gets separated from the biomethane and recycled. |
| Another creative idea of the time saw 80 council vehicles powered by biogas produced at the Christchurch sewage plant. |
| He covered solar energy, wind energy, biomass and biogas, geothermal activity and thermal power. |
