The theory of the carbon levy, which is using a charge to partially internalize what was previously an economic externality in terms of economic theory, is well recognized as being a sound approach.
We did our carbon pricing audit very early on, to look at mostly design issues, coverage, equitability and all those things that are still being discussed today. We haven't done another follow-up that looks at exactly how much bang for their buck they're getting out of the carbon price, but the theory of carbon pricing in economics is a sound one, so long as it's widely applicable and the price is high enough to induce the behavioural change that is sought.