A recent conversation with a major Swedish bank has sparked a deep reflection on the role of technology, particularly APIs, in combating climate change. The text emphasizes the urgent need for technologists, vendors, suppliers, engineers, and architects to accept their responsibility in reducing resource consumption and carbon emissions. It highlights that while digital transformation often celebrates innovation, it is largely driven by energy from fossil fuels, which exacerbates environmental issues. APIs, which account for a significant portion of global web traffic, are identified as a critical area where efficiency improvements can lead to substantial energy savings and cost reductions. The text advocates for designing, building, and managing APIs with sustainability in mind by minimizing unnecessary data processing and optimizing deployment strategies. It stresses that consumers are increasingly prioritizing sustainability, with many willing to pay more for environmentally friendly products, thus putting pressure on companies to prove their sustainability credentials. The article is part of a series that will further explore how APIs can support sustainability goals and the implications of architecture choices on environmental impact.