This book contains the printed edition of the special issue on New
Studies in EROI (Energy Return on Investment) that appeared inSus-
tainability(http://www.mdpi.com/journal/sustainability/).Sustainability
(ISSN 2071-1050; CODEN: SUSTDE) is an international and cross-
disciplinary, scholarly, open access journal of environmental, cultural,
economic and social sustainability of human beings, which provides an
advanced forum for studies related to sustainability and sustainable de-
velopment.Sustainabilityis published by MDPI online monthly.
Multidisciplinary Digital Publishing Institute (MDPI)
Basel, SwitzerlandISBN: 3-906980-31-6