assumptions regarding energy mixes, growth, demographics, urbanisation and built space  utilisation but this list will have to be further developed by the bidder.  National and industry sector roadmaps will inform this task but business as usual should  consider expected change and not necessarily visions set out, if these are considered to be at a  level of ambition beyond general expectation. It is possible for this task to set out two  business as usual trajectories per region, one plausible and one ambitious. Links between  operational and embodied carbon shall be considered.  The result of this task shall give a clear understanding of the typical levels of embodied  carbon along the factors set out above. Figures of stronger certainty, with more detail, shall be  provided for up to 2030, but the following 20 years shall also be reasonably depicted. The  results shall for all regions present figures on the micro (building level) as well as the macro  level (national level) and set the latter in the context of the overall national carbon emissions  and climate objectives.  Having assessed trajectories of expected embodied carbon levels, this task will take the  objectives of climate neutrality for 2050 and 55% net emissions reduction for 2030, and back  cast where we would have to be at different moments in time from now on and up to 2050, to  reasonably be able to succeed. The work should take into account existing trajectories  underlying EU climate and energy policies.  The discrepancy between this backcast and the business as usual trajectories for the different  regions shall be described. It shall be set in context of the overall climate objectives and  compared with other carbon reduction solutions elsewhere in the economy to give a sense of  the magnitude and impact potential.  The task will go on, supported by the visualisation of contributions to embodied carbon as set  out in task 2, to identify embodied carbon reduction solutions or strategies. A broad approach  shall be taken, also considering aspects such as the use intensity of buildings and innovative  ways of providing services. Existing national and sectoral roadmaps (or others) will have a  key role in informing this part of the study. It is not the task of this contract to set out policy  suggestions but to point to different categories of reduction solutions and to indicate the  magnitude of the improvement potential at different points in time up to 2050. These  magnitudes shall be made quantitative up to at least 2035/2040. In this exercise, the different  regions as set out earlier shall be considered, potentially also different building types. The  reduction solutions shall be classified based on their likely time of broad implementation (low  hanging fruit, exiting solutions with good replication potential, innovation, expected future  development).  Careful consideration of the links between operational and embodied carbon shall be given  and these shall be described and quantified where relevant. The overall goal is to identify  solutions reducing whole life carbon.  The result of this task will on the one hand set out the growing gap between where we are  heading without major changes and the expected path needed to meet our climate objectives,  and on the other hand give a good overview of existing and future reduction solutions, with  their reduction potential. Task 4. Set the trajectory towards climate objectives and identify reduction solutions  8