What is a “fair” amount of greenhouse gas (GHG) reduction to expect from a company? As individuals, companies, industry sectors, and nations take action to reduce their greenhouse gas (GHG) emissions, it helps to know whether these actions are adequate. For the sake of argument, for example, we might say that if a single industry sector generates x% of all GHG emissions,then that sector should be responsible for x% of the overall GHG reductions proposed by the Intergovernmental Panel on Climate Change (IPCC). This one-page document was created as an experiment in telling the mathematical story of how an individual, company, industry sector, or nation would go about calculating its unique responsibilities on the basis of this logic.

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