CO2L Constraint Bug

[ktehranchi]

Checklist

• [X] I am using the current master branch
• [X] I am running on an up-to-date pypsa-usa environment. Update via conda env update -f envs/environment.yaml

The Issue

I noticed the plots for the global accumulated emissions show that the accumulated CO2 is way above what the constrained CO2L is... In plots below co2base: 225.0e+6 meaning we should have 0.5 and 0.1 * CO2Base

Steps To Reproduce

No response

Expected Behavior

No response

Error Message

No response

Anything else?

No response

[ktehranchi]

Lol- Note if you specify an uppercase CO2 versus Co2- no error is thrown and no constraint is added. It could be good to add a warning/error if someone makes this mistake