## 2 Materials and Methods  
We carried out a systematic literature review (SLR) to conduct this study. This method was chosen because it synthesises the available evidence that summarises the information on a particular topic [20]. It is characterised by being systematic, critical, rigorous, specific, and reproducible [21; 22]. We followed different phases to carry out the review [21; 23], as detailed below:  
* Phase 1: Identification of the research questions In this phase, we posed these research questions (RQ) to achieve the objectives: RQ1: What are the main papers that study poverty, climate change, and social inequality? RQ2: What are the most relevant journals in which papers related to poverty, climate change, and inequality are published? [21; 22; 23] RQ3: What has been the evolution of these papers during the period 1999-2020? [21; 22; 23] RQ4: Which countries, universities, and areas of knowledge show the most significant interest in the field of poverty, inequality, and climate change? [21; 22; 23]RQ5: Who are the most productive authors on the subject of poverty, inequality, and climate change? [21; 22; 23]  
RQ6: What research topics are being addressed in the field of poverty, climate change, and social inequality? [21; 22; 23]  
RQ7: Which groups are most affected by poverty, inequality, and climate change, according to the articles analysed? Phase 2: Search strategy  
To carry out this stage, we considered the search terms of the information to be addressed [24]. For this purpose, we used the main concepts referred to in this research, recognising the different forms of writing, and synonyms and abbreviations [21]. In addition, the quality standards of the Prisma statement (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) were used to include the relevant items and ensure the internal consistency of the systematic review [25]. We chose two of the most relevant academic databases for the information search process: Web of Science (WoS) and Scopus. These databases mainly collect scientific research products because of their multidisciplinary and international nature. Both are identified with an impact factor in their publications: the Journal Citation Report (JCR) for WoS and the SCImago Journal Rank (SJR) for Scopus [26]. The algorithm used in both databases was \"poverty\", \"climate change\", \"inequality\" with AND as the Boolean operator. The study period was from 1999, when the first publication appeared according to the search parameters used, until 2020. As a result of the search, we obtained 720 papers, which were filtered according to the inclusion and exclusion criteria (Table 1). For this purpose, we retrieved scientific articles with a publication date between 1999 and 2020 [27], published in English. To meet the quality criteria of the literature, we searched for articles published in scientific journals [28], and those referring to primary studies [29], obtaining 480 contributions (279 from WoS and 201 from Scopus). We exported these documents to the Endnote database to continue applying the inclusion and exclusion criteria [30], as indicated in Table 1. In selecting research papers, we did not consider other types of publications such as books, book chapters, doctoral theses, colloquia, seminars, workshops, or conventions in this systematic review of the literature. We only considered articles published in scientific journals to ensure their quality [21; 23]. Following the definition of the inclusion and exclusion criteria, the next step was the selection of articles. For this, we followed several stages (Figure 1). As shown in Figure 1, in the first stage, we identified 480 articles, which were exported to Endnote to eliminate duplicates (\(n=119\)). In the second stage, we excluded all those articles that did not have restricted access to full text (\(n=46\)) [31], and those that did not have any citations (\(n=89\)). This is a determining aspect of the papers' relevance as a significant indicator of influence [32].