## 2 Estimation and Comparison of Natural and Recycled Aggregates in Sardinia, Italy
### CDW Management in Sardinia, Italy  
The tool used to analyse CDW management in Sardinia is the Regional Special Waste Plan (_il Piano Regionale dei Rifituti Speciali_ (PRRS)), approved on 21 December 2012 [30]. Thisannual report considers allwaste produced, processed, transported or sent for disposal in the region. According to these data, CDW production amounted to a total of 658,676,965 kg, which accounts for 9% of the total regional production of hazardous waste, and corresponds to 670 kg per capita. It should be noted, however, that this production is considered only part of CDW; this is just the amount that is declared by treatment plants. The production of CDW in Sardinia (approximately 670 kg/individual/year) appears to be under-valuedas compared to the national average (approximately900 kg/inhabitant/year), and by comparison with the data obtained from the Model of the Environmental Declaration (_Modello Unico di Dichinarzione Ambientale_ (MUD) [31]) for other territories in the national context. Table 2 shows that most of this type of waste in Sardinia is subject to recovery (295,092,875 kg, approximately 53% of the total) and the remaining share, 258,736,682 kg, is destined for disposal. \begin{table}
\begin{tabular}{l c c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**2014**} & \multicolumn{6}{c}{**\% Variations in Quantity**} \\ \cline{3-11}  & \multicolumn{3}{c}{**Millions (\(\mathbf{\ell}\))**} & \multicolumn{3}{c}{**2008**} & **2009** & **2010** & **2011** & **2012** & **2013** & **2014** & **2015** & **2008–2014** & **2008–2015** \\ \hline
**Buildings** & **135,332** & \(\mathbf{-2.4}\) & \(\mathbf{-8.6}\) & \(\mathbf{-4.7}\) & \(\mathbf{-4.2}\) & \(\mathbf{-7.6}\) & \(\mathbf{-6.9}\) & \(\mathbf{-3.5}\) & \(\mathbf{-2.4}\) & \(\mathbf{-32.0}\) & \(\mathbf{-33.6}\) \\ \hline
**Houses** & 66,482 & \(\mathbf{-0.4}\) & \(\mathbf{-8.1}\) & \(\mathbf{-0.1}\) & \(\mathbf{-2.9}\) & \(\mathbf{-6.4}\) & \(\mathbf{-5.7}\) & \(\mathbf{-2.4}\) & \(\mathbf{-1.3}\) & \(\mathbf{-28.7}\) & \(\mathbf{-29.7}\) \\ \(\bullet\)_New_ & 20,565 & \(\mathbf{-3.7}\) & \(\mathbf{-18.7}\) & \(\mathbf{-6.1}\) & \(\mathbf{-7.5}\) & \(\mathbf{-17.0}\) & \(\mathbf{-19.0}\) & \(\mathbf{-10.2}\) & \(\mathbf{-8.8}\) & \(\mathbf{-62.3}\) & \(\mathbf{-65.6}\) \\ \(\bullet\)_Extraordinary_ & \multicolumn{3}{c}{**45,917**} & \multicolumn{3}{c}{**3.5**} & \multicolumn{3}{c}{**3.1**} & \multicolumn{3}{c}{**4.8**} & \multicolumn{3}{c}{**0.6**} & \multicolumn{3}{c}{**0.8**} & \multicolumn{3}{c}{**2.9**} & \multicolumn{3}{c}{**1.5**} & \multicolumn{3}{c}{**2.0**} & \multicolumn{3}{c}{**18.5**} & \multicolumn{3}{c}{**20.9**} \\ \hline
**Non-Residential** & 68,850 & \(\mathbf{-4.4}\) & \(\mathbf{-9.1}\) & \(\mathbf{-9.4}\) & \(\mathbf{-5.7}\) & \(\mathbf{-9.1}\) & \(\mathbf{-8.0}\) & \(\mathbf{-4.6}\) & \(\mathbf{-3.5}\) & \(\mathbf{-35.0}\) & \(\mathbf{-37.2}\) \\ \(\bullet\)_Private_ & 43,357 & \(\mathbf{-2.2}\) & \(\mathbf{-10.7}\) & \(\mathbf{-6.9}\) & \(\mathbf{-2.1}\) & \(\mathbf{-8.0}\) & \(\mathbf{-7.2}\) & \(\mathbf{-4.3}\) & \(\mathbf{-3.0}\) & \(\mathbf{-23.6}\) & \(\mathbf{-25.9}\) \\ \(\bullet\)_Public_ & 25,493 & \(\mathbf{-7.2}\) & \(\mathbf{-7.0}\) & \(\mathbf{-12.6}\) & \(\mathbf{-10.5}\) & \(\mathbf{-10.6}\) & \(\mathbf{-9.3}\) & \(\mathbf{-5.1}\) & \(\mathbf{-4.3}\) & \(\mathbf{-48.1}\) & \(\mathbf{-50.3}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Investments in the construction sector [26,28]. The Regional Special Waste Plan (PRRS) does not include items of import/export for CDW in Sardinia. This plan sets objectives forthe recovery and disposal of this waste as indicated in Table 2. In 2008, material recovery was 53%, 12 percentage points below the 2015 objective goal of 65% (Table 3). The rate of landfilling is still too high to be overlooked. In addition, Table 3 indicates that the percentage of recycling should be distributed, according to the objectives for 2015 and 2020.