# Industry 4.0 Technologies for Manufacturing Sustainability:
## 1 Introduction  
Competitive business environment, mass customization and globalization are forcing \"traditional\" industries to adopt new business models and shift towards Industry 4.0 [1, 2]. Industry 4.0 technologies can be considered as the new revolution in manufacturing which aims to achieve maximum efficiency and output by minimum resource utilization [3]. Industry 4.0 technologies have brought a new manufacturing trend in industries which aimed at effective resource utilization for maximum output. \"Smart manufacturing\" or \"digital manufacturing\" can be considered as the core of Industry 4.0 which allows industries to perform flexible manufacturing operations with mass customization [4]. [PERSON] et al. [5] stated that Industry 4.0 is a German initiative which aimed at creating smart factories in which manufacturing technologies are transformed and upgraded by the Internet of Things (IoT) and cyber-physical systems (CPS). Manufacturing systems in Industry 4.0 can monitor the physical processes of industry and create a so called \"digital twin\" of physical entities [6]. This helps to establish real time communication, intelligent decision making and man-machine interaction in manufacturing organizations. Industry 4.0 technologies combined smart production with embedded production system which hastransformed the production value chains, industry value chain and traditional business models of organizations [7]. IoT, CPS, augmented and virtual reality, blockchain technology, machine learning (ML), artificial intelligence (AI), big data analytics and digital twins can be considered as key enabling technologies for Industry 4.0 practices [8]. It is believed that Industry 4.0 technologies will help to enhance the social and economic sustainability of organizations [3]. Industry 4.0 technologies have a remarkable potential for sustainable value creation across the economic, environmental and social dimension of sustainability by improving resource efficiency [9].  
Despite the probable opportunities for manufacturing sustainability in Industry 4.0, there are few review studies that have explored the Industry 4.0 technologies with different sustainability perspectives [4; 8; 9; 10]. [PERSON] and [PERSON] [3] highlighted the sustainable manufacturing (SM) opportunities in Industry 4.0. [PERSON] et al. [10] developed a sustainability framework for Industry 4.0. [PERSON] et al. [9] identified critical success factors for SM in Industry 4.0 era. [PERSON] et al. [4] highlighted new research trends and scopes for SM in Industry 4.0. [PERSON] et al. [8] presented a bibliometric-based review to highlight research opportunities for SM in Industry 4.0. [PERSON] et al. [11] highlighted the relationship between the circular economy, SM and Industry 4.0 practices. This shows that there is growing interest in the area of SM and Industry 4.0, yet there is scarcity of systematic review which highlight new research scopes for manufacturing sustainability in Industry 4.0. The past review studies were limited to a specific database. This paper seeks to explore the research trends and scopes for manufacturing sustainability in Industry 4.0 with three major databases i.e., IEEE, Web of Sciences and Scopus. This paper also highlights the research trends in manufacturing area in ten different Industry 4.0 technologies and then provide the sustainability issues for manufacturing.  
The structure of this review paper is as follows. Section 2 highlights the basic concepts and terminology related to sustainability and Industry 4.0. Section 3 presents the review protocol and methodology. Section 4 presents the results of systematic literature review. Section 5 presents the role of different Industry 4.0 technologies to achieve sustainability. Section 6 presents the opportunities of Industry 4.0 technologies to achieve manufacturing sustainability. Section 7 presents research gaps in Industry 4.0 to achieve sustainability, and Section 8 presents the conclusion and future scopes of study.