So the evidence they provided was what I said is carefully curated. I work in sustainability and I see how people mess with numbers. I also know info from China is famous for fudging numbers as well. I don't think CO2 is a good metric as it is difficult to track. The way companies track CO2 now is usually by spend so they convert $$$ to CO2 output through a calculator. It's really not efficient.
You asked me what is an alternative and I said I don't know. I really don't, unless we have a way of tracking what comes in and out of a business and how it is used.