US Total Primary Energy Intensity, 1980-2011 from: http://www.eia.gov/countries/country-data.cfm?fips=US#tpe …pic.twitter.com/J4pbvN0Lq7
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@Spl0nky The numbers I found for the whole planet followed a similar trend:https://docs.google.com/spreadsheets/d/1QSQj6GlY5AB-a-BPpM3229zeP3nmixKBCE6wVA7UsEo/edit …