Handling of `Emissions|CO2|Other` and `Emissions|CO2|Waste` - Docs and Warning?

[jkikstra]

The SCMs are only given two variables as input: Emissions|CO2|AFOLU and Emissions|CO2|Energy and Industrial Processes (after harmonization & infilling).

If Emissions|CO2|Other and Emissions|CO2|Waste are reported as non-zero, they will be added to Emissions|CO2|Energy and Industrial Processes.

To make this more clear, we should do two things:

• update the docs for Expected Input
• add a check that gives a warning (or error) if input data might have double-reported for instance Carbon Dioxide Removal (negative emissions), meaning that Emissions|CO2 != Emissions|CO2|AFOLU + Emissions|CO2|Energy and Industrial Processes + Emissions|CO2|Other + Emissions|CO2|Waste

[chrisroadmap]

This is thorny - it depends on what the source of the waste emissions are. If (some fraction of) the waste emissions are originally from biogenic sources then they shouldn't be counted as contributing to a net input of CO2 into the atmosphere. I guess this only applies to one or two IAMs?

[chrisroadmap]

then again if we're talking <2 % of total CO2, then it is a similar or smaller magnitude to the cement carbonation sink, which I'm not sure is handled at all in the reporting of CO2 emissions

[jkikstra]

Let's wait with this until the ScenarioMIP guidance is complete.