That's needlessly complex. It's means testing for CO2. Means testing is a huge waste of effort, imo.
If the US, Europe, Russia, India, and China stop burning fossil fuels, we'll be well on our way. I'm not really worried about whether Ecuador is burning fossil fuels right now, it cannot be a meaningful amount of output compared to those 5.
all the mining, industrial etc companies were public companies on stock exchanges (most of em anyway), with audited accounts. you might still be able to find old order books, like they did with slavery and the dutch east india company. you could easily find numbers for production and then make rough conservative estimates off the back of that
If the US, Europe, Russia, India, and China stop burning fossil fuels, we'll be well on our way. I'm not really worried about whether Ecuador is burning fossil fuels right now, it cannot be a meaningful amount of output compared to those 5.