**3. LCI of a modern MSW landfill**

According to [20] the composition of waste materials has fundamental influence on environmental emissions associated with waste treatment, recycling and disposal and may play an important role also for the LCA of waste management solutions.

According to [21] to carry out a LCA, there is a need for LCI data in order to ensure a representative assessment. Major LCA methodological steps, including among others inventory analysis, are illustrated in [1], based on EC [22, 23]. LCI data on waste management processes involves recycling, source separation, collection, transport and upgrading of recyclables, and it is readily available [24].

 Several definitions of solid waste exist. In the review given in [3], waste, according to [25], is neither water (wastewater) nor airborne (flue gases). According to [26] urban solid waste is defined as the waste generated by household, businesses, industries, institutions and markers, as well as the waste coming from the cleaning of streets and public areas [26].

It should be noted that Environmental Research and Education Foundation (EREF), a non-profit organization, is one of the largest sources of funding solid waste research in North America; it defines solid waste as [27]:


 Agricultural wastes (that are not handled by the waste industry), nuclear waste and land-applied wastewater treatment sludge are generally not included in this definition [27].

*Life Cycle Inventory (LCI) Modeling of Municipal Solid Waste (MSW) Management Systems… DOI: http://dx.doi.org/10.5772/intechopen.84347* 
