Environmental Solutions (ESA) is a Singapore-based company that specializes in harvesting and recovering metals from spent resources. It was founded in 1999 and is a thought leader in Asia for recovering base metals, precious metals, and energy from industrial catalysts, auto catalytic converters, and metal-bearing wastes. ESA believes it can efficiently and effectively harvest spent resources through expert knowledge, innovative methods, holistic solutions, and using the latest technology. It has operations across several Asian countries and has achieved converting copper sludge to concentrates and reusing steel dust.