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Try the following:
Assume a base scenario for the external world and those involved, and then study scenarios where those involved to adopt different strategies of carbon intensity and compare those scenarios with the base one. The later scenarios can involve different paths of carbon intensity, as well as different ways to achieve the same carbon path.
Assume an alternative base scenario for the alternative world with a different path of carbon intensity due to carbon actions in the external world, then also study some scenarios.
Of course, you can also assume different costs and benefits of carbon actions, i.e. earlier versus later actions, costs and benefits associated with different actions.
Importantly, you need to compare the relative competitiveness between those involved and the external world over time and implications for their present values.
Assumptions are very important and they need to be realistic.
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