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Glossary of Terms: M

Marginal Abatement Cost (MAC): The cost of reducing emissions by one tonne of CO2e. An aggregation of these costs against total tonnes abated creates a firm's marginal abatement cost curve. The lower the MAC curve, the more effective the firm's emission reduction strategies

Methane (CH4): Greenhouse gas with a Global Warming Potential of 21. The primary sources of methane are landfills, coal mines, paddy fields, natural gas systems and livestock (e.g. cows and sheep).

Methane Recovery: the capture and re-use of methane emissions either through cost-effective management methods or through power generations. Methane Recovery projects include:
• Animal Waste Methane
• Coal Mine Methane
• Deep Methane Injection
• Landfill Gas Recovery/Biomass Capture

Mitigation: In the context of climate change, a human intervention to reduce the sources or enhance the sinks of greenhouse gases. Examples include using fossil fuels more efficiently for industrial processes or electricity generation, switching to solar energy or wind power, improving the insulation of buildings, and expanding forests and other "sinks" to remove greater amounts of carbon dioxide from the atmosphere.
MobileSource Emissions Reduction Credits: MSERCs are ERCs approved by the governing agency that are derived from measures that reduce emissions from mobile sources (e.g., converting buses to clean fuels, scrapping cars, etc.).

Monitoring: Monitoring relates to the regular measurement, assessment and recording of emissions and emission reductions by an emitting firm or an emission reduction project.

Montreal Protocol: an international treaty to eliminate the production and consumption of ozone-depleting chemicals adopted in Montreal on 16 September 1987.

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