Wouldn't you expect the country with the most manufacturing and one of the biggest population to also have the biggest pollution?
I feel you'd need to adjust the sum total by something, capita, or square footage or be more specific like does a manufacturing X in China pollute more than an equivalent one in the US, etc.
Not all goods and services involve the same process, some come with more pollution.
For example, Nvidia will contribute to a big chunk of US GDP, but it only designs the chips, which won't have the same pollution impact as the country in which they'll have it manufactured.
I feel you'd need to adjust the sum total by something, capita, or square footage or be more specific like does a manufacturing X in China pollute more than an equivalent one in the US, etc.