International congress center (MCK) and the Spodek arena in Katowice, where the 2018 UN climate summit and the annual European Economic Congress were held will undergo an overhaul to increase their environmental sustainability. Their owner (the city of Katowice) and managers (PTWP Event Center) want to switch to more balanced operations. It is a matter of optimizing the cost of their use, but also the quality and comfort for viewers and participants.