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In page Carbon price:

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In order for such a business model to become attractive, the subsidies would therefore have to exceed this value. Here, a technology openness could be the best choice, as a reduction in costs due to technical progress can be expected. Already today, these costs of generating negative emissions are below the costs of CO2 of $220 per ton,[2] which means that a state-subsidized business model for creating negative emissions already makes economic sense today.[citation needed] In sum, while a carbon price has the potential to reduce future emissions, a carbon subsidy has the potential to reduce past emissions.