[Theldiot (OP)]

Are there multiple sources for an emissions inventory?

For instance, how debated is the UNFCCC GHG inventory?

And is there any international inventory that has an emissions breakdown like the Australian Department of the Environments?

[evan_au]

Just across the pond, New Zealand was paying attention to this long before Australia.
http://www.mfe.govt.nz/climate-change/reporting-greenhouse-gas-emissions/nzs-greenhouse-gas-inventory