Corporate Carbon Audit

LECTURES 2-3 CORPORATE CARBON AUDIT

Agenda
 Carbon Footprint Concepts  Why and What  Carbon Measurement Standards and Procedures  Emission Scopes and Conversion Factors  Assignment

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Agenda
 Carbon Footprint Concepts  Why and What  Carbon Measurement Standards and Procedures  Emission Scopes and Conversion Factors  Assignment

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Carbon footprint is a “measure of the impact human Carbon Footprint activities have on the environment in terms of the amount of green house gases produced, measured in unit of carbon dioxide” www.carbonfootprint.com

Six Kyoto Gases
Symbol CO2 CH4 N2O HFCs Name Carbon Dioxide Methane Nitrous Oxide Hydrofluorocarbons Common Sources Fossil fuel combustion, forest clearing, cement production, etc. Landfills, production and distribution of natural gas & petroleum, fermentation from the digestive system of livestock, rice cultivation, fossil fuel combustion, etc. Fossil fuel combustion, fertilizers, nylon production, manure, etc. Refrigeration gases, aluminum smelting, semiconductor manufacturing, etc. Aluminum production, semiconductor industry, etc. Electrical transmissions and distribution systems, circuit breakers, magnesium production, etc.

PFCs

Perfluorocarbons

SF6

Sulfur Hexafluoride

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Global Warming Potential
 GWP is a measure of how much a given mass of GHG is estimated to contribute to global warming  It is a relative scale which compares the gas in question to that of the same mass of CO2 (whose GWP is by convention equal to 1)  GWP is a factor of
 Radiative efficiency (heat-absorbing ability) of each gas relative to that of CO2  Decay rate of each gas (the amount removed from the atmosphere over a given number of years) relative to that of CO2

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Global Warming Potential
Gas CO2 CH4 N2O HCFC-22 HFC-134a PFC-14 SF6
Sources:

GWP-100 yr time horizon SAR 1995 1 21 310 1500 1300 6500 23900 22200 TAR 2001 1 23 296 1700 1300 4AR 2007 1 25 298 1810 1430 7390 22800

SAR