Unit for comparing cloud datacenters?

I would like to make a comparison regarding sustainability between different cloud datacenters and local servers. What kind of unit would you guys suggest I use for that? Would look something like “CO2 equivalents per UNIT”. Do not know a lot about clouds and how their hardware work so that is why I need help. xx

Compiling a cloud services comparison is a daunting task in the rapidly-evolving cloud computing landscape. Not only are there thousands of cloud services and dozens of cloud service providers, each provider frequently changes or upgrades their service portfolio.1

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