Methane (CH₄) emissions arise from a variety of sources including coal mines, anaerobic (without oxygen) decomposition of waste in landfills, incomplete fossil fuel combustion, the treatment of waste water and certain industrial processes.

Methane is a potent greenhouse gas, 21 times more harmful than the equivalent volume of CO₂ emissions. Even though methane combustion produces CO₂ emissions, these are far outweighed in damage to the global atmosphere by the reduction in methane emissions.

Green Gas, as a company specialising in developing, investing in, and operating methane energy projects, is already reducing methane emissions from coal mine and landfill methane projects it has installed and operates. Projects realised by Green Gas currently reduce over 10 million tons of CO₂ equivalent emissions each year and Green Gas plans on increasing this to well over 20 million tons by 2012. Put in perspective 20 million tons of CO₂ reductions have the same benefit at reducing greenhouse gas emissions as planting over 6 million acres of trees, or reducing all CO₂ emissions from heating about one million homes, or removing five million cars from the world's roads.