Add to ORKGThe aim of the thesis is to review current green information technologies and current research on the mentioned area. It’s focused on themes of efficient usage of large scale computer systems. At the beginning it tries to give a reason for implementation of energy savings with themes from area of climate change. Afterwards it’s focused on energy efficiency of large scale computer systems. The failure is in fact that this thesis is unable to solve the problem of climate change. For a better energy efficiency we already know the mechanisms of electrical energy savings from mobile devices. These mechanisms need an adaptation to be useful for a large scale computer systems as in supercomputers and data centres. We were successful in finding and...