Benoit's main fields of expertise are environmental economics, environmental financing, economic instruments for pollution control, and cost-benefit analysis. He has assessed the economic costs and benefits of large hydro-power projects (including Laos, Viet Nam, and Ethiopia), and designed and tested market-based instruments for pollution control (including Viet Nam, Philippines, Thailand and Sri Lanka). He has designed public disclosure programs for industrial environmental performance and national and local environment and conservation funds, including the preparation of regulations and operational guidelines (including Laos, Viet Nam, Philippines and Thailand). More recently, he has provided support to numerous projects aiming to enhance knowledge on the economics of adaptation to climate change and has co-authored numerous reports and publications on this topic with the World Bank and the Asian Development Bank.