Prepared by: Asst. Lecturer Al-Batool Abdulmahdi Saleh With the rapid expansion in the use of technology and digital systems, energy consumption in computer systems and data centers has become an increasing environmental challenge. Computing devices, ranging from personal computers to large-scale servers, consume significant amounts of energy and produce carbon emissions that impact the environment. Hence, the concept of green computing has emerged as a modern trend in computer engineering, aiming to design and use computer systems in ways that reduce energy consumption and natural resource use while minimizing negative environmental impacts. Green computing refers to a set of practices and technologies aimed at making the use of computers and technology more energy-efficient and environmentally friendly. These practices include designing low-power computing devices, improving software efficiency, and managing computing resources in ways that reduce energy and material waste. Green computing also seeks to extend the lifespan of devices and promote the recycling of their components to reduce electronic waste. Green computing is gaining increasing importance due to the rising global demand for digital services and cloud-based applications. Studies indicate that data centers consume a significant share of global electricity. Therefore, adopting green computing strategies contributes to reducing energy consumption and lowering operational costs, in addition to decreasing greenhouse gas emissions. These strategies also support the achievement of sustainable development goals through the responsible use of technology. Strategies for Designing Environmentally Friendly Computer Systems Energy-Efficient Hardware Design One of the most important strategies is the development of processors and electronic components that consume less power while maintaining the required performance. This is achieved through advanced manufacturing technologies and improved power management within devices. Improving Software Efficiency Software plays a significant role in energy consumption. Unoptimized applications may consume processor and memory resources unnecessarily. Therefore, developers focus on writing more efficient algorithms that reduce unnecessary computational operations. Virtualization and Cloud Computing Virtualization technologies allow multiple operating systems or applications to run on a single server, reducing the need for a large number of physical devices. Cloud computing also helps optimize resource utilization and reduce energy consumption in data centers. Energy Management in Computer Systems Modern systems rely on energy management techniques such as shutting down unused components or reducing processor speed when high performance is not required, thereby lowering electricity consumption. Recycling and Reducing Electronic Waste A key principle of green computing is the reuse of computing components and the environmentally safe recycling of old devices to reduce the accumulation of electronic waste, which poses risks to both the environment and human health. Challenges Facing Green Computing Despite its significant benefits, green computing faces several challenges, such as the high initial cost of developing energy-efficient technologies, the need for advanced infrastructure to support green systems, and the lack of awareness among some institutions regarding the importance of adopting such practices. Green computing is considered an important direction in the development of modern technology, as it seeks to achieve a balance between technological advancement and environmental preservation. By adopting strategies for designing energy-efficient computer systems, improving software efficiency, and utilizing modern technologies such as cloud computing, the environmental impact of technology can be significantly reduced. Therefore, promoting research and development in this field is a fundamental step toward building a sustainable digital future that supports both the environment and the economy.