The current climate emergency dictates that immediate action is required to mitigate climate change, which implies that carbon fluxes occurring 20 or more years from now are too late to have any mitigative effect. Economic models discount monetized carbon fluxes, but do not include any discussion of physical carbon fluxes. To respond to a climate emergency, however, future physical carbon fluxes need to be discounted at a high rate to incentivize action today. Using the DICE model, we demonstrate that physical discounting of carbon erodes the effectiveness of afforestation and bioenergy projects that reduce emissions over time. Our analysis indicates that policymakers need to convert concerns about climate urgency into an actual policy variable, namely, a weighting scheme that discounts future physical carbon into a current - value equivalent, thereby removing incentives to delay climate action.

当前的气候紧急情况表明需要立即采取行动减缓气候变化，这意味着 20 年或更长时间后发生的碳通量为时已晚，无法产生任何减缓作用。经济模型对货币化的碳通量进行了折扣，但不包括对物理碳通量的任何讨论。然而，为了应对气候紧急情况，未来的物理碳通量需要以很高的速度折现，以激励今天的行动。使用 DICE 模型，我们证明了碳的物理折扣会侵蚀随着时间的推移减少排放的造林和生物能源项目的有效性。我们的分析表明，政策制定者需要将对气候紧迫性的担忧转化为实际的政策变量，即一种将未来实物碳折现为当前价值等价物的加权方案，