The analysis of energy-related carbon dioxide emissions presented here is based on data in the Monthly Energy Review (MER). Chapter 12 of the MER reports monthly U.S. energy-related carbon dioxide emissions derived from EIAâs monthly energy data.
The Viking Age is the period from the late 8th century to the mid-11th century in European history, especially Northern European and Scandinavian history, following the Germanic Iron Age.
There is no such thing as the Viking age, you can say the Viking time (witch only is a term), but not Viking age -that's only make the hole article confusing. Vikings were people from Scandinavia during a period of the Iron age.