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TEWI stands for "Total Equivalent Warming Impact." It's a comprehensive metric used to assess the overall environmental impact of a product or system over its entire lifecycle, taking into account not only direct emissions of greenhouse gases but also indirect emissions associated with energy consumption, manufacturing, transportation, and disposal. TEWI provides a holistic perspective on the environmental footprint of a technology or product by considering its impact on global warming potential, including both short-lived and long-lived greenhouse gases such as carbon dioxide, methane, and nitrous oxide. By quantifying the cumulative emissions associated with all stages of a product's lifecycle, TEWI enables policymakers, businesses, and consumers to make informed decisions about sustainability and climate mitigation strategies. This metric is particularly valuable in evaluating the environmental performance of refrigeration and air conditioning systems, where refrigerants with high global warming potentials are commonly used, and where energy efficiency and lifecycle emissions play significant roles in determining overall environmental impact. By incorporating TEWI into decision-making processes, stakeholders can identify opportunities for reducing emissions, improving energy efficiency, and promoting the adoption of more environmentally friendly technologies, thereby contributing to global efforts to combat climate change and promote sustainable development.