Climate change and future depletion of resources are two of the most important environmental challenges that humankind have ever faced. This mini-review aims to give a second chance to contaminated water and recalcitrant carbon dioxide (CO₂) streams by putting forward a resilience and sustainable technology based on electron-driven microbial reactions. A critical assessment of the current application of microbial electrochemical technologies (METs) in the field of electro bioremediation of contaminated water and bio-electro CO₂ recycling in wastewater treatment plants (WWTPs) is performed. Data from lab-scale and pilot-plant studies is shown to prove that MET is a highly promising and cost-effective technology for the sustainable remediation of contaminated sites while producing biofuels and/or commodity chemicals from recalcitrant CO₂ streams emitted in WWTPs.