“according to some top environmental economists, we have good reason to believe the true cost of emitting carbon is actually a lot higher than even a $51 price tag suggests.
There are a couple of reasons for that. First, until recently, the economists who calculated the SCC had barely factored in one of the biggest harms that climate change can cause: human mortality. Second, the way the SCC had been calculated rested on a problematic premise: that damage in the future counts for significantly less than damage in the present.”
https://www.vox.com/future-perfect/22643358/social-cost-of-carbon-mortality-biden-discounting