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Point of sale, like every other taxed commodity.

Asking corporations to track their supply chain for their carbon usage is a complete waste of time. All the information a firm needs is already reflected in the price of its goods/services.

This is why economists are in near universal agreement that a carbon tax is the optimal policy. It’s dead simple to implement as it only requires tracking the sales of producers.

You don't need to track your carbon if the carbon tax is already integrated into the electricity price. From the article:

> By 2026, those companies will have to publicly disclose how much carbon is produced by their operations and electricity use.

Basically this puts a reporting burden on everyone instead of the place where the carbon is sourced - probably an oil or gas company.

> How are you going to tax it if you don't track it?

This is a very good point, you should have stopped here instead of devolving into a purity spiral by attacking somebody who's obviously coming from a similar point of view: https://en.wikipedia.org/wiki/Purity_spiral