There is no such thing as a business as usual scenario
The discussions about how much it will cost to mitigate climate change is a smokescreen. What constitutes a cost is not an objective fact, but laden with assumptions and subjective values.
How much does it cost to stop climate change, to keep within the target of the Paris agreement?
The answer depends on who asks and what is meant by costs. In the normal case we would say that something costs when we have to pay for something that we buy or possibly that we make ourselves, counting our work as a cost. In the mainstream discussion of climate change mitigation, cost can also mean loss of income or a lower GDP compared to a business as usual scenario. There are very small costs for the Brazilian government in protecting the Amazon. But the contribution of a protected Amazon forest to the Brazilian economy is small compared to the timber that could be sold, the hydroelectricity and minerals that could be extracted, the soy or beef that could be produced.
There are many pits to fall into when discussing the cost of climate change mitigation.
First, to compare mitigation measures with business as usual scenarios that omit the increasing cost of climate change is simply misleading. The costs of inaction are certainly bigger than the costs of action.
Second, the business as usual scenario is based on that existing goods and services are desirable and that not doing certain things incur a loss of sorts. But there is no such relationship. If the US cuts spending on its military in half it would be just fine. If I skip a trip to Bangkok nobody will suffer.
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