The escalating environmental contamination from industrial activities, oil exploration, and plastic waste necessitates innovative and sustainable remediation approaches. Advanced bioremediation techniques offer eco-friendly solutions by harnessing biological systems to detoxify pollutants. This chapter explores three cutting-edge strategies: phytoremediation of heavy metals, mycoremediation for oil spills, and Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) based genetically engineered microbes for plastic degradation. Phytoremediation employs hyperaccumulator plants to extract, stabilize, or volatilize toxic heavy metals such as lead, cadmium, and arsenic from contaminated soils and water bodies. Mycoremediation utilizes the enzymatic and absorptive capabilities of fungi, particularly white-rot species, to degrade complex hydrocarbons and restore oil-contaminated environments. Furthermore, the integration of genetic engineering, particularly CRISPR-Cas systems, has enabled the development of tailor-made microbial strains capable of degrading recalcitrant plastics like polyethylene terephthalate (PET) and polyethylene (PE), and polystyrene (PS), thereby accelerating decomposition processes that would otherwise take a prolonged time. These engineered microbes offer enhanced specificity, metabolic efficiency, and adaptability, presenting a promising solution to the global plastic waste crisis. These techniques collectively represent a paradigm shift in environmental biotechnology, offering scalable, low-cost, and sustainable alternatives to conventional physicochemical remediation methods. However, challenges such as ecological risks, biosafety concerns, and field scalability remain to be addressed. Future research should focus on optimizing these approaches through interdisciplinary integration, risk assessment frameworks, and field validation to ensure environmental and public safety.