As the world faces climate change, we need to reduce greenhouse gases and achieve sustainable development. This is causing big changes in the global energy landscape. Clean energy is key to this change and will make the future greener, healthier and more resilient. Solar, wind, hydropower, geothermal and bioenergy are the future of energy. They use natural resources to make energy without using up the earth's resources or polluting the environment. This study looks at clean energy and how it can help fight the negative effects of using too much fossil fuel. Clean energy is now a key topic in politics, the economy and society. Using these energy sources in our homes, workplaces and communities is the best way to protect the planet for future generations. This text looks at the technical, economic and environmental aspects of clean energy. It shows how renewables could change global energy systems. Clean energy offers a path to energy independence, as well as opportunities for innovation, job creation and economic growth. By understanding clean energy in the context of sustainability, we can move closer to a future where energy is both abundant and environmentally friendly. This book have been prepared for ERASMUS+ DIGITAL GREEN project (2022-1-TR01- KA220-SCH-000087638). We would like to Turkish National Agency and EU for supporting our projects. We also thanks to Eskişehir Osmangazi University and University of Calabria for supporting us during activities.