There is a real problem with accounting for carbon, in my view, because carbon pricing is beyond the control of the company. The carbon market is a wholly artificial market, created for regulatory purposes, not a natural market as such. That means it is hard to use as a real measure in accounting.
Carbon pricing puts emissions into every price in the economy. Corporate accounts are composed with market prices. Therefore carbon pricing entirely solves the problem of carbon accounting.
Except this doesn’t provide an income so it can’t be an acceptable solution. Therefore, instead, the insistence on pulling figures out of the auditor’s arse instead.