SAP OKT trainings (OCI4.1SAP Carbonimpact 4.1) for SAP Carbon Impact 4.1. Onsite training is currently available in US. You can find more information in this link http://www.sap.com/services/education/ and search for SAP Carbon Impact.
Once you attend the training SAP provides documentation on SAP Carbon Impact, right now there is not much information available on public domains.
SAP also offers subscription based access to SAP carbon impact and also a demo system for training. You check with your company account representative for accessing and subcription.
Even occuasinoally SAP conducts webnairs on SAP Carbon impact - check regularly if you can attend a demo session to gain some overall idea on SAP Carbon impact 4.1 / 4.2
Thanks and Regards