An individual, company, industry sector, or nation can be held responsible for 'generating' emissions in a number of ways. For example, emissions can be calculated on a direct basis (e.g. 'How many GHG emissions did I generate from my own activities) or an indirect basis (e.g. 'What are the upstream emissions that result from my economic activity/demand?') There is no 'right' answer on this point, and much of the politics of international climate change negotiation revolve around how to balance these perspectives, which are sometimes referred to as 'Scope 1' and 'Scope 3' emissions, respectively. The proposed mathematical method works for either perspectives, but its simultaneous use for both perspectives would result in double-counting of impacts.