The EPA just raised the number they use for the social cost of carbon from $22 to $36 per metric ton of CO2. Brad Plumer has more background.... So what does this cost the average American -- or, rather, what would it cost if Americans were required to pay for their carbon pollution?
Here are some numbers:
The carbon intensity numbers and conversions come from this useful EPA page. Abbreviations: MJ = megajoule = 0.28 kilowatt-hours (kWh) = 239 food calories; t = tonne = metric ton = 1,000 kg. 12,000 kWh is about what the average household uses in electricity every year.
Right now the US has emitted 5.30 gigatons of CO2 in the last 12 months, which has a social cost of $191 billion, or 1.2% of GDP. That's higher than I would have guessed, but doesn't seem absurdly high.