Session 2: What do we know This session covers what we understand or do not understand about the situation. What data we have? Do we understand this well enough? Where is more measurements research needed? Are the methodologies sufficient? Who do we need to connect with in order to improve our understanding? Are there areas where our expertise is not sufficient and we need others? Agenda: • Talks (4 x 15 min) These talks give the participants some information, but should potentially also highlight some open questions or challenges, which can be food for discussion in the later part of the agenda. • What we know about ICT energy usage? Is there any misinformation about it? (Michael Welzl) • Network operator energy consumption and trends (Jens Malmodin and Nina Lövehagen) • Role of peak demand in energy consumption (Daniel Schien) • What we don’t know? (TBD) • Discussion (60 min) Session chair is Colin Perkins.