Achieving a truly sustainable AI continuum requires a holistic approach, where both cloud and edge infrastructures are designed with efficiency in mind. This session highlights the EcoCloud initiative at EPFL, showcasing how it serves as a living example of sustainability in cloud computing. We will discuss how sustainability principles must be integrated at every level—from hardware and system design to software optimization—to build energy-efficient hybrid cloud-edge AI systems. A key focus will be on EcoCloud's experimental facility, which provides a sustainable playground for researchers and industry partners to test and validate novel hardware-software co-design approaches. This facility enables real-world experimentation on energy-efficient architectures, allowing us to push the boundaries of sustainable AI. The talk will also emphasize how these technologies can be leveraged to create scalable, low-power, and environmentally responsible AI solutions. Attendees will be encouraged to actively engage in discussions, making this an interactive session.