The management of waste globally is a cause of concern for the environment, nature, and people’s health. This poses a significant issue for the future. With the world's population expanding and their consumption levels increasing, the quantity of waste being produced each day is also growing. Waste material management can be improved by converting the carbon-containing waste material into valuable materials, such as carbon nanomaterialsNanomaterials (CNMs)Carbon nanomaterials (CNMs). These materials have the potential to be employed in different industrial devices with a variety of applications such as energyEnergy storage devices. This book chapter's comprehensive review discusses the latest advancements and investigation of global solid waste that is converted into CNMs. The modifications to the design of supercapacitorsSupercapacitors and their influence on operational dynamics have been addressed. The chapter also discusses the techniques utilized by scientists to assess the energyEnergy storage capabilities of different supercapacitors.