Worldwide, the number of people suffering from hunger is around 702 and 828 million, and 2.3 billion people have moderate or severe food insecurity. This situation is striking, considering that the vast amount of food discarded globally equals 1.3 billion tons annually. For this reason, in 2015, world leaders agreed to a global agenda for 2030, adopting the Sustainable Development Goals (SDGs). Among its objectives, are to fight against poverty, hunger, and gender inequality worldwide and achieve environmental sustainability. With this framework, this article uses a top-down mass balance approach to calculate food loss and waste (FLW) by country’s food security level. In addition, it explores the causes of FLW and its impacts on natural resources, climate change, food security, and the SDGs in countries with a weak and moderate level of food security. The estimated global FLW was 1498 million tons of food in 2017. The most food discarded was concentrated in countries with good food security, 894.3 million tons. In contrast, the lowest food discard occurred in countries with a weak level of food security, 11.4 million tons. The primary outcome of this paper is to establish a link between the levels of food security and food loss in different countries, which may serve as a guide for the design of specific public policies.

Climate change is a shift in the climate’s condition that lasts for an extended period, usually decades or longer, and that may be detected by changes in the mean and variability of its parameters. The full spectrum of players and their related value-adding activities, that are a part of the food supply chain, including the disposal of food items derived from agriculture, forestry, or fisheries, are collectively called food systems. Food systems are a component of their larger economic, social, and environmental contexts. Finally, food security is the condition in which all individuals consistently have physical and financial access to adequate safe, nutritious food that satisfies their dietary needs and food choices for an active and healthy life. Climate change and its relationships with food systems and security are complex since food systems significantly contribute to climate change. However, climate change impacts food systems unpredictably, leading to food insecurity through adverse impacts on the four dimensions of food security: utilization, access, food availability, and stability. Climate change adaptation plans are urgent and include measures such as flood and climate protection, waste management and recycling, climate-smart agriculture, and analytical climatic conditions innovation equipment on agricultural processes and activities. Nevertheless, addressing the climate crisis and its adverse impacts on food security through the activation and promotion of innovation needs reliable information and intervention in many different but interconnected fields, such as institutional design, philanthropy, novel partnerships, finance, and international cooperation. In this context, this paper analyses the relationship between climate change, agriculture, and global–local strategies to ensure food security and also discusses policies’ role in fostering innovation for supporting local agro-food systems and their capacity to sustain societal needs.

The Food and Agriculture Organization (FAO) reports that Latin America and the Caribbean experienced the most rapid rise in food insecurity, with approximately 47.7 million individuals in the region affected by hunger in 2022. In Chile, almost three million people, 15.6% of the country’s population, do not have regular access to sufficient nutritious food and suffer from some form of food insecurity. Moreover, Chile is particularly susceptible to the impacts of climate change and contends with the depletion of several critical natural resources, notably water, stemming from severe and prolonged drought conditions. This article aims to comprehensively evaluate food loss and waste (FLW) in Chile and analyzes the implications of FLW on the sustainable development goal (SDG). This will be achieved by utilizing a top-down mass balance methodology that integrates various data sources and an in-depth analysis of the main food categories at different stages of the food supply chain (FSC). In 2021, Chile generated 5.18 million tons of FLW, with fruit being the largest contributor at 2.5 million tons (48% of total FLW). Vegetables accounted for 0.8 million tons (16%). Other food groups each contributed 1% to 10% of the total FLW. Per capita FLW was 295 kg. FLW varied by food group and FSC stage. Fruits, vegetables, starchy roots, and pulses had the most FLW early in the FSC, while cereals had it later. Comparing FLW with the domestic supply quantity of food, it is observed that 68% of the fruit available for the population was discarded. Vegetables and starchy roots also showed significant volumes of discarded food, with 48% and 29% of the availability of these products in Chile. Furthermore, we explore the implications of FLW on realizing SDG 2—zero hunger, particularly emphasizing its correlation with target 12.3. The research underscores the potential of its findings to significantly shape public policies and strategies concerning FLW and their alignment with the associated SDGs, making a tangible impact on the lives of millions.

Undernourished and food insecurity are recognized as two highly relevant topics. Approximately 820 million people in the world are undernourished and 2 billion people have moderate or severe food insecurity (FAO). In addition, globally roughly one-third of food is not consumed and is wasted. This article aims to provide an updated estimate of food loss and waste (FLW) in China as, in the period 2016–2018, there were still 122 million people in this country experiencing undernourishment. In this research, we use a top-down mass balance approach, discuss how it affects the achievement of SDG 2, Zero Hunger, that it is linked also to target 12.3 that “seeks to halve global food waste at retail and consumer levels, as well as to reduce food loss during production and supply” (United Nations). We point out some challenges that private and public policies still need to overcome to reduce FLW. The results of this research may contribute a more accurate baseline for the design of public policies and strategies related to FLW and the corresponding SDGs.

Throughout history, schools of economic thought have defined political economy—or economics—and its object of study in multiple ways. This paper reflects on the definitions of economics by schools of economic thought and also proposes the concepts of value and scarcity as key concepts to explain the differences between them. The most important findings of the paper are: (a) the ontological and epistemological characteristics of the concept of value and scarcity have shaped the definitions of economics; (b) the boundaries of the study object of economics have been expanded since today’s mainstream economics deals with multiple topics as diverse as crime, education, development, health, etc. However, the methodological tools used in mainstream economics have been narrowed since approaches such as the philosophical, ethical, historical, and institutional approaches have been left behind; (c) the part of reality that mainstream economics can grasp have left behind important issues of the contemporary world, such as gender, social, and environmental issues. A clear understanding of the scope and boundaries of economics could help to define more realistic research questions for economic science, and it would help to define new economic paradigms that address the contemporary issues.