Hi Uncle Steve! I just returned from a trip to Iceland. I would start here: http://www.eia.gov/tools/faqs/faq.cfm?id=19&t=3
The Energy Information Administration website will hopefully help.
For the unassigned cost of carbon emissions, I would start here: https://www3.epa.gov/climatechange/EPAactivities/economics/scc.html
I hope this is helpful!
Say hi to Ruth for me!