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The global‐scale empirical analysis of how renewable energy policies (REPs) affect carbon emissions and the mediating role of renewable energy development (RED) in this mechanism remains underexplored. To fill this research gap, we extracted and organized REPs data from IEA's databases for 135 countries until 2018 and conducted empirical analyses of these issues. We find that: (a) REPs significantly reduce global carbon emissions, especially through regulatory, economic, and R&D policies. (b) REPs' effectiveness in mitigating carbon emissions is enhanced by robust energy infrastructure, strong control of corruption, and adherence to the rule of law. Besides, the balance of REPs types does not influence their efficiency, but REPs prioritizing certain renewable energy (RE) types aligns better with carbon reduction goals. (c) RED displays a Janus‐faced influence on REPs' carbon reduction effect—renewable energy consumption (REC) positively mediates it, whereas renewable energy share (RES) exerts a negative mediation. Specifically, REC consistently reduces carbon emissions, while RES initially increases and then decreases carbon emissions, exhibiting an inverted U‐shape. (d) The initial rise in carbon emissions with RES is due to the low substitution of RE for fossil energy and the country‐specific heterogeneity in organizational, geographic, industrial, economic, demographic, and temporal factors. Plain Language Summary: This study looked at how renewable energy policies (REPs) help lower carbon emissions worldwide and the role of renewable energy development (RED) in this process. We used data from the International Energy Agency on 135 countries up to 2018. Our findings show that REPs are effective in reducing carbon emissions, particularly through laws, economic incentives, and research and development. The success of these policies is better in countries with strong energy infrastructure, good governance, and rule of law. Interestingly, not all types of REPs are equally effective; those focusing on specific types of renewable energy (RE) align more closely with carbon reduction goals. We also discovered a dual role of RED in this scenario. While the use of RE helps lower emissions, just increasing the share of RE in the overall energy mix can initially lead to more emissions before eventually decreasing them. This increase at first happens because RE doesn't immediately replace fossil fuels and because countries are different in terms of their organization, geography, industry, economy, population, and changes over time. Key Points: Renewable energy policies (REPs) cut global carbon emissions, mainly via regulatory, economic, and R&D policiesREPs' carbon reduction boosted by robust infrastructure, anti‐corruption, and law adherenceRenewable energy development has a Janus‐faced impact on REPs' carbon reduction effect [ABSTRACT FROM AUTHOR]

The effect of industrialization and technological developments and the rate of population growth have begun to disrupt the ecological balance in the world. A large share of the deterioration of this balance is due to the rapidly increasing energy demands of people. Fossil fuels and renewable energy sources are used to obtain the energy that is needed by human beings. Most of the world's energy needs are met by fossil fuels such as coal, oil, and natural gas. These resources, which we call fossil fuels, cause many parallel environmental problems, such as global warming, climate change, and carbon emissions, for the world and nature. The most affected by all these experiences, of course, is the entire production sector, which is dependent on energy. However, textile and apparel, which is a pioneer in taking steps towards harmonization with the Green Agreement, is one of the sectors that started the transition to green energy within the scope of the European Union and brands' net-zero targets. Within the scope of the Green Agreement, Turkey has participated and started to work for a 70% carbon reduction, which is the target for 2030, and carbon neutrality, which is the target for 2050. Therefore, within the scope of these targets, the textile sector of Çukurova Region, which has the highest export rate in Turkey, was chosen. Within the scope of this study, carbon emission, which is one of the global problems, was examined within the framework of the ISO 14067-ISO Product Based Carbon Footprint (CF) standard by examining the production of a textile company, and the results were analyzed in detail. The main innovation of this article is to follow all stages of the fabric called Tricia, which is the most produced product in the textile industry, from its entry as fiber to its exit as fabric in the factory, and to calculate and analyze the amount of carbon that is released into nature. The dynamic and experimental results showed that it was determined that 6.00 tons of carbon dioxide carbon were released in the time it took for the fabric to go to the sewing room as a fabric. [ABSTRACT FROM AUTHOR]