## 4 Discussion  
The differences between regions and industrial activities show how the discrepancy of C&D waste production can be significant within the country. To have a clearer perception of how data can change based on the economic status of a region, the territory and the size, some specific cases have been chosen collecting data during a five-year time frame. Confronting the most prolific region, Lombardia, with the less fruitful regions such as Molise and Valle D'Aosta, it can be seen that not all regions present the same behaviour regarding production over time. As shown in Figure 7, the production of Lombardia was linked with economic issues with a decreasing value until 2015 and increasing the quantity of waste with the improvement of the economy after the crisis, with the highest value of 13.2 million tonnes in 2018. The decrease and increase phenomena were not so extended, with only a difference of approximately 1 million tonnes. In the case of Valle D'Aosta,the increase during years 2014 and 2015 presented a difference of 221,005 tonnes with a decrease after 2015 with a difference of the value of 399,764 tonnes. Clearly, the values seem small compared to the 1 million tonne difference found in Lombardia, but the low total rate of waste production as to be considered, because this region is small and so is the production. This result shows how for the small region of Valle D'Aosta the economy was affected in a different way having more repercussions, compared to Lombardia, where, thanks to its status as a bigger region, could survive better to the difference of the market. Considering the region Molise in the South compared to Lombardia, another behaviour is presented. This region, similar to Valle D'Aosta, is small and with a limited number of inhabitants and reduced industrial activities. As shown in Figure 8, the adaptation to the economic situation arrived at different timing. In Lombardia the decrease took place between 2014 and 2015, and after that there was only a recovery phenomenon. In Molise, there was a gradual increase in C&D waste production until 2016 with a small decrease of only 6550 tonnes in 2017, followed by another increase of 114,473 tonnes. This behaviour presents a different approach to the economical market, showing that for this part of the country where the industries are not so prevalent, other factors take place in the quantity of waste produced, leading to a smoother transition between increase and decrease and with pick often unexpected [16]. The recycling and waste management regarding C&D affects the residue waste from processing materials and components, casings or their packaging, demolition residues, excavations polluted by hazardous substances and water resulting from the processing [3]. Considering that 40% of the special waste production is C&D [4] and according to the European Union at least 70% of that should be recycled, as shown previously in Figure 6, the country somehow manages to reach that objective, achieving 75% of recycled material in 2017 [4]. The law establishes that the person who must deal with the disposal of construction waste is the waste producer, meaning, the company or the individual who carries out the work. For the correct management of the waste, a priority hierarchy was established, where the less sustainable options presented are the last shown in Figure 9.  
Figure 8: C&D waste production behaviour in the region of Lombardia and Molise. Source: Own elaboration with ISPRA data. Figure 7: C&D waste production behaviour in the region of Lombardia and Valle D’Aosta. Source: Own elaboration with ISPRA data. Although construction sites, in addition to being places of \"production\" of waste, can also be considered as potential places for reuse of part of the waste materials, the fragmentation of the process and the lack of geographical and temporal coincidence between demolition activities and activities construction often makes it difficult, if not impossible, to reuse the waste produced on-site [8].