Application of the data envelopment analysis technique to measure the environmental efficiency of the 27 countries of the European Union during the period 2012-2020.

Unlabelled: In the last decade, we have experienced a changing geopolitical context that has caused changes in the energy context. In addition, human activity contributes to global warming or sea level rising, i.e.

Optimisation of Maintenance Policies Based on Right-Censored Failure Data Using a Semi-Markovian Approach.

This paper exposes the existing problems for optimal industrial preventive maintenance intervals when decisions are made with right-censored data obtained from a network of sensors or other sources. A methodology based on the use of the z transform and a semi-Markovian approach is presented to solve these problems and obtain a much more consistent mathematical solution. This methodology is applied to a real case study of the maintenance of large marine engines of vessels dedicated to coastal surveillance in Spain to illustrate its usefulness.

Will the Balearics and the Canary Islands meet the European Union targets for municipal waste? A comparative study from 2000 to 2035.

Recycling and selective collection rates in touristic islands are low, and they have to be increased to move them towards a more circular economy. This paper attempts to determine whether it will be possible to achieve the European Union's (EU) legally binding targets regarding the different fractions of municipal solid waste (MSW) in the two Spanish regions with the highest per capita MSW generation rates. After reviewing the MSW generation literature in touristic islands, the driving forces affecting MSW generation in the Balearics and Canary archipelagos from 2000 to 2018 are identified.

Modelling the driving forces of the municipal solid waste generation in touristic islands. A case study of the Balearic Islands (2000-2030).

The improvement of municipal solid waste (MSW) management in touristic islands has not been sufficiently studied, and by using the Spanish Balearics as a case study, a hybrid methodology has been developed which: (i) identifies the three most influential variables (driving forces) of the MSW generation system through an econometric model based on official historical data for a given period (2000-2014), (ii) develops a System Dynamics (SD) model of the evolution of MSW generation in this archipelago based on the same data and time period, and (iii) forecasts the performance of the MSW management system for a future period (2015-2030). Six different scenarios are considered with varying assumptions, objectives and management policies, while applying Scenario Analysis to the SD model developed. The results show that by maintaining the current policies ("business as usual" BAU scenario) it will be impossible to meet the goals set by the Regional and the Spanish National Plans based on the European MSW Directive.

Comparison of the carbon footprint of different patient diets in a Spanish hospital.

Objectives: Mitigating climate change requires management strategies to reduce greenhouse gas emissions in any sector, including the health system. Carbon footprint calculations should play a key role in quantifying and communicating these emissions. Food is among the categories with low accuracy because the carbon footprint for food is still under development.