###### Abstract  
Coffee is one of the most widely consumed beverages worldwide. This has motivated the coffee industry to adopt sustainable practices, with an increased emphasis on environmentally friendly extraction methods. The objective of this study was to explore, through a bibliometric analysis, the identification of influential researchers, institutions, emerging topics, and gaps concerning the valorization of coffee by-products and residues using green extraction techniques. A total of 7306 scientific publications on green extraction were identified, 72 specifically addressing coffee or its by-products. The analysis highlights a focus on innovative green technologies, such as natural deep eutectic solvents, ultrasound-assisted or microwave-assisted extraction. These methods enable the efficient and sustainable extraction of bioactive compounds, including polyphenols, chlorogenic acid, caffeine, with potential applications in food, pharmaceutical, and energy industries. Despite this, research on coffee by-products remains limited, partly due to their use in other applications, such as biochar, animal feed, and construction materials, which do not rely heavily on green technologies. Key contributors to the field include countries such as Spain, Italy, Brazil, and China. This study emphasizes the potential of coffee waste to generate high-value products through sustainable methodologies, identifies noteworthy research and key actors in the field, and underscores the necessity for further innovation and collaboration. c 2025, 15, 1505  
Article  
Codee is a traditional beverage with a global market that has experienced significant growth due to increasing consumer demand [1]. Originating as an energy supplement among Ethiopian tribes, coffee is now consumed worldwide in various forms, ranging from traditional infusions like espresso to modern styles such as cold brew [2]. It is estimated that approximately 500 billion cups of coffee are consumed daily [3]. Around 33% of global coffee consumption occurs in Europe, predominantly in Scandinavia, followed by countries in Asia, Oceania, and the Americas, although tea remains the most consumed beverage in some regions [3; 4; 5]. This rising demand has led to a doubling of coffee production, with cultivation now occurring in over 70 countries, including Brazil, Vietnam, and Colombia, as well as nations in South America, South Asia, and Central Africa [6; 7]. The growing demand for coffee has brought several environmental concerns, primarily related to its production and consumption. In 2015, the United Nations introduced the Sustainable Development Goals (SDGs), which, when applied to the coffee sector, have the potential to drive significant improvements in areas such as wastewater treatment, residue management, and labor conditions [8; 9]. Key environmental challenges include the high consumption of water resources, the significant volume of waste generated, and the inefficient use of coffee by-products such as coffee pulp, husks, silver skin, and spent coffee grounds (SCGs) [4]. For instance, coffee grounds are one of the most prevalent forms of organic waste globally, posing serious environmental concerns due to improper disposal practices [10]. Despite these challenges, coffee by-products and waste have considerable economic potential because of their composition, which includes valuable compounds such as fatty acids, polysaccharides, polyphenols, and minerals [4]. These materials can be repurposed across various industries, including pharmaceuticals, cosmetics, food, and energy. This creates a circular economy in which these by-products are revalued and transformed into biofuels, biopolymers, bio-fertilizers, food additives, or construction materials [4; 6; 10]. The process of extracting these compounds and products can be expensive, low yield, or result in significant environmental contamination [11].