"The United States does not have a carbon price, per se, and Biden would struggle to get bipartisan congressional support for imposing one. Think tank Resources for the Future has suggested instead a greenhouse gas index against which companies’ output would be assessed. For crude oil and related products in 2016, the U.S. government would have provided export rebates of about $20 billion and charge imports about $40 billion."
Carbon Border Tax Isn't About Carbon
A breakdown of carbon border taxes in Reuters cites research by RFF regarding a greenhouse gas index.
Media Highlight from Reuters — March 22, 2021