Market Failures: Pricing Carbon with Wishful Thinking
Consider two numbers assigned to the same ton of carbon dioxide, each claiming scientific validity. The first: a figure between $1 and $7, representing the first Trump administration’s calculation of the societal damage caused by each ton of CO₂. The second: $190, representing the Biden administration’s calculation for that identical quantity of carbon. This metric, the social cost of carbon (SCC), is a single number meant to represent the total harm—from crop losses to health problems to sea-level rise—caused by emitting one ton of carbon dioxide. It has become a central battleground in U.S. climate policy. The usual explanation for this whiplash is political: one side follows science while the other ignores it. But that story misses a more fundamental problem. The first Trump administration didn’t need to deny climate science to gut the SCC—it simply exploited the metric’s built-in manipulability, using established government guidance to select assumptions that minimized the result. By changing just two parameters—the discount rate and geographic scope—the administration reduced the figure from $51 to between $1 and $7 per ton, …
