  In this paper we propose a methodology suitable for a comprehensive analysis
of the global embodied energy flow trough a complex network approach. To this
end, we extend the existing literature, providing a multilayer framework based
on the environmentally extended input-output analysis. The multilayer
structure, with respect to the traditional approach, allows us to unveil the
different role of sectors and economies in the system. In order to identify key
sectors and economies, we make use of hub and authority scores, by adapting to
our framework an extension of the Kleinberg algorithm, called Multi-Dimensional
HITS (MD-HITS). A numerical analysis based on multi-region input-output tables
shows how the proposed approach provides meaningful insights.
