Kentaka Aruga is a professor at the Graduate School of Humanities and Social Sciences, Saitama University. He received his Ph.D. in Environmental and Natural Resource Economics from the University of Rhode Island, where he developed expertise in applied econometrics, resource economics, and quantitative policy analysis. His research is characterized by rigorous empirical methods and strong policy relevance. Professor Aruga has authored a textbook on Environmental and Natural Resource Economics and has conducted extensive research on global commodity markets. Using time-series analysis, he has examined price dynamics, market integration, and volatility in commodities such as soybeans, rare metals, copper, and energy resources. His work explores how markets respond to macroeconomic shocks, financial activity, and structural shifts in global supply and demand. More recently, his research has focused on green finance and sustainable investment. He studies retail and institutional investors’ perceptions of green, sustainability, and blue bonds, aiming to clarify how financial markets can support the transition to a low-carbon economy. He also serves as an editor for Scientific Reports and Humanities and Social Sciences Communications, and as a Topic Advisory Panel Member for Sustainability, published by MDPI.