The World Bank has a great resource here which lists out pricing for emissions trading systems (ETS) and carbon tax by country.[0] (Map & Data > Price > Type of Instrument). Highest carbon taxes are $100+ / ton (Sweden, Switzerland, Lichenstein), high initial value for trade is about $50 (EU, Switzerland).

We are a bit behind in the US in credits or taxes, we are now treating the social cost at $51, but not using that for tax or trade policy.[1]

There's one more number that is useful to get a numerical sense of the costs: $258 / ton, an estimate of the actual cost to society. [2]

[0] https://carbonpricingdashboard.worldbank.org/map_data [1] https://www.scientificamerican.com/article/cost-of-carbon-po... [2] https://www.nature.com/articles/s41467-021-24487-w

That estimate of cost to society should tell us something when contrasted with the actual prices being levied right now. Hopefully we'll get closer to that number eventually!

Hopefully the US does this: https://news.climate.columbia.edu/2021/05/06/proposed-45q-ta...

Haha gotcha, European ETS is on a bit of a tear at the minute. Has risen to ~$70/tonne CO2