2) the syntax (boolean operators) and keywords adopted 
 sustainability

AND single-use products 

AND Italy 

AND University

AND caffetteria 

AND waste 

3) the initial number of items collected 
- Galileo Discovery (9.315 ---> reduced to 6) 
- Google Scholar (4.760.000 ---> reduced to 56.000)
- Katalog der UB Wuzburg (5921484 ---> 28.185)

4) what we did to reduce it 
using the boolean operator AND 

5) results which can be useful for our intervention 
UNEP (2020)_ Single-use plastic take-away food packaging and its alternatives. Recommendations from Life Cycle Assessments

Ertz et al. (2017)_From single-use to multi-use. Study og consumers' behavior toward consumption of reusable containers

Gallego-Schmid et al. (2018)_Environmental impacts of takeaway food containers

ISF_Food container final report 2018

Hussain et al. (2020)_Analysis of the Usage of Plastic Utensils. A Case Study of Universities in Islamabad

Simantiris (2024)_Single-use or paper products? A dilemma that requires societal change