We don't have some common fossil fuel terms

[areleu]

Description of the issue

I have been trying to annotate multiple power plant databases including but not limited to those coming from the https://globalenergymonitor.org/ and they often refer to fossil fuels that we either have but with a different label or we do not have.

Missing alternative labels:

• bituminous coal for coking coal
• brown coal for lignite

Missing entities:

• coal waste/refuse as subclass of fossil waste fuel (and I would argue also of coal)
• light (crude?) fuel oil and heavy (crude?) fuel oil, these I am not really sure if they should be alternative labels of existing terms or if they should be implemented.
• Related to the last is probably naphta not really sure if is the same s light crude oil.
• coalbed methane maybe a sublcass of natural gas? or an alternative label of colliery gas
• agricultural waste fuel as subclass of waste fuel or maybe of biogenic industrial waste fuel?

Ideas of solution

I think coal waste/refuse bituminous coal and brown coal are clear but the oils are open to discussion. I think this should expand on https://github.com/OpenEnergyPlatform/ontology/issues/1318

Workflow checklist

• [ ] I discussed the issue with someone else than me before working on a solution
• [x] I already read the latest version of the workflow for this repository
• [x] The goal of this ontology is clear to me

I am aware that

• [x] every entry in the ontology should have a definition
• [x] classes should arise from concepts rather than from words