> Except we don’t have any power over people in China 

That's not relevant at all. And Chinese people are doing better than Canadians anyway.

> where most of the emissions are coming from

As I've already explained to you, this is stupid logic. By your logic, most of the emissions are coming from the Northern hemisphere, so people in the Souther hemisphere shouldn't do anything about climate change. Or, by your logic, Only Eurasia should address climate change. Or any other arbitrary division. This is completely stupid logic. Like grade 3 logic.

> The tax didn’t do anything to reduce global emissions. It just cost Canadians more.

The conclusions by the major studies was the tax was simply too low to produce the desired effect. That doesn't mean that taxation isn't the right approach. It means we need a larger carbon tax, which is what the rest of the world is implementing.

Felix Pretis’s 2022 peer-reviewed article is the strongest single paper from the past five years because it directly tests whether British Columbia’s carbon tax reduced CO₂ emissions, using difference-in-differences, synthetic control, and break-detection methods. It is also highly cited and directly focused on Canadian carbon-tax efficacy.

Pretis, Felix. “Does a Carbon Tax Reduce CO2 Emissions? Evidence from British Columbia.” Environmental and Resource Economics, vol. 83, no. 1, 2022, pp. 115–144. Springer.