A paradigm shift in sustainability: from lines to circles

Abstract

The concept of sustainability is attracting great attention as societies become increasingly aware of the environmental consequences of their actions. One of the most critical challenges that humankind is facing is the scarcity of resources, which are expected to reach their limits in the foreseeable future. Associated with this, there is increasing waste generated as a consequence of rapid growth in the world population (particularly in urban areas) and a parallel rise in global income. To cope with these problems, a linear strategy has been applied to increase efficiency by reducing the use of materials and energy in order to lessen environmental impacts. However, this cradle to grave approach has proven inadequate, due to a lack of attention to several economic and social aspects. A paradigm shift is thus required to re-think and innovate processes (as early as in the design phase) in such a way that materials and energy are used more effectively within a closed-loop system. This strategy, known as the cradle to cradle approach, relies on the assumption that everything is a resource for something else since no waste is ever generated in nature. In line with the cradle to cradle approach, the bio-inspired circular economy concept aims at eco-effectiveness, rather than eco-efficiency. While the circular economy has neither a confirmed definition nor a standardized methodology, it nonetheless carries significant importance, since it “is restorative and regenerative by design and aims to keep products, components, and materials at their highest utility and value at all times, distinguishing between technical and biological cycles,” in accordance with the goals of the 2030 Agenda for Sustainable Development. Despite some controversial opinions that “circles are not spirals, and for growth to occur, spirals with ever-increasing radii are required,” the circular economy concept is taking a central role in the sustainable development debate and, for this reason, deserves attention. The aim of this paper is to shed light on this debate, pointing out the main features of the emerging circular paradigm along with sustainability transition theories and circularity evaluation tools.

Isolation and Screening of Microorganisms for the Effective Pretreatment of Lignocellulosic Agricultural Wastes

“…Because people are becoming more aware of their actions' impact on the environment, sustainability is gaining a lot of attention. To rethink and reinvent processes in such a way that materials and energy are used more effectively inside a closed-loop system, a paradigm shift is necessary [ 9 ]. Pretreatment is a critical step in establishing an economically viable biorefinery.…”

Valorisation of Agri- and Aquaculture Residues via Biogas Production for Enhanced Industrial Application

“…They are environmental services, source of biofertiliser and biochemicals, energy production, and GHG emission reduction with an improvement of air quality, especially in cities [36]. In this context, use of biogas as a part of a circular economy with production of value-added commodities and/or utilities as cooling energy is the most attractive option in zero-waste approach [37,38]. Nevertheless, biogas is currently mainly used to produce electricity and heat.…”

Spent coffee waste as a renewable source for the production of sustainable poly(butylene succinate) biocomposites from a circular economy perspective

“…[1][2][3] If on one hand using sustainable ways of treating both raw and secondary resources is very challenging for the industry, on the other hand, it could lead to decreased energy demand for technological manufacturing operations, lower urban waste generation, and the reduced environmental pressures and impacts of industrialization on ecosystems. 4 Thus, there is an ongoing search for sustainable, cleaner technologies and circular raw materials to fulll the scarcity of critical resources for the industry's growing demands. 5 The shi from a linear to a circular model of the economy is increasingly based on achieving and furthering key resource loops such as reuse, repair, remanufacture, and recycling.…”