This book provides detailed knowledge on different types of pollutants and their hazardous effects on the environment, humans, animals, and plants. It also describes various modern nano-remediation approaches utilizing different nanomaterials for treatment/management of different wastes, such as nanomaterial-mediated degradation of pharmaceutical and personal care products, nanomaterial-mediated wastewater treatment, nano-biotechnology in solid waste management, nanotechnology in biohydrogen and biodiesel production, and nano-biotechnology in e-waste management. This is an urgent matter for the safety of the environment and for human and animal health.