A Crossing-Line Between Transportation Evaluation and NaturalCapital Assessment: Perspectives on Ecological Economics and Project Evaluation

Introduction:Ranging from everyday choices to political arrangements, making the most efficient and effective outcome of the givencircumstances is a critical part of decision-making process. Accordingly, achieving a balanced and sophisticated perspective indecision-making process is a hard task. However, there are possible ways to direct this issue, at least to some conceptual extent, andthis article identifies possible considerations for more sustainable infrastructure planning decisions. Methods:This study presents a thorough review on project evaluation and transport externalities, especially in terms of ecological valuations.After that, a case study on a high-speed rail in the state of Texas, USA is examined to elaborate suggested solutions in sustainabletransportation decision-making. Results:To appropriately reflect the changes in ecological features induced by a transportation project, location specific or project-basedmeasurements are critical parts. There are certain ways to capture the monetary values of ecological features. Using the suggestedmethods, two high-speed rail alternatives are compared, and the one with more ecological preservation is considered could save thedifference identified in construction in less than 15 years with the savings in monetary values of ecological features. Conclusion:Because environmental impact is often regarded in a separate study measuring the degree, not the economic values associated with it,precise meaning of ecological externalities is hard to understand. However, many scholars in both transportation and ecologydisciplines emphasize the need for more inclusive considerations on opportunity costs of natural environments, and recentlytechnological advances made this issue become more plausible. Based on Texas case, calculating monetary values of ecology couldprovide a different future about transportation investments, and for that reason, we should think more thoroughly on externalities