About the Author: Paolo Bertoldi is a senior expert in sustainable energy, climate change and energy efficiency at the European Commission. Some of his key areas of expertise include: Energy Service Companies (ESCOs), market based instruments, multilevel governance, environmental leadership, ICT energy consumption. He is an experienced Editor In Chief. Bertoldi is also skilled in sustainable energy, corporate social responsibility, climate change polices, and data centre, and is in charge of policy analysis for energy efficiency at the European Commission where he has served as Energy Efficiency Expert and Senior Expert for a total of 28 years. He is also a Laed Author for IPCC Reports. He has an engineering degree focused in energy systems and electrical system from University of Padova, Italy