What are the advantages & disadvantages of landfill power?

'Green' energy source	Advantages	Disadvantages
Landfill Gas	•         Needed to reduce methane gas emissions •         Efficient use of waste products •         Positive extraction prevents soil infiltration, preserves vegetation •         Clean, visually and audibly unobtrusive sites •         Makes electricity, heat and fuels •         People willing to pay for 'green energy' (e.g. organic food)	•         Recycling reduces landfill available •         Generation site must relocate when gas is exhausted •         Much larger volumes of landfill are required for the same amount of electricity produced by fossil fuels