This aim of this paper is to discuss how ICT (information and communication technologies) can contribute to the challenge of not crossing PBs (planetary boundaries), in order to enable a safe operating space for humanity. PBs define limits for nine key ecological equilibriums that should not be crossed, such as a maximum temperature increase of 2°C over the next 100 years for the climate PB. ICT (both hardware and software) play a dual role in this PB challenge.