Which factor should be considered for reducing the environmental impact of materials used in construction?

Transportation distances is a critical factor for reducing the environmental impact of materials used in construction because it directly relates to the energy consumption and emissions associated with moving materials from their source to the construction site. Greater transportation distances generally lead to higher greenhouse gas emissions due to the fuel consumed during transit. By choosing materials that are sourced locally or are readily available within a shorter distance, the overall carbon footprint of a construction project can be significantly reduced. Additionally, reduced transportation distances can lead to more efficient logistics and lower costs associated with fuel, potentially impacting the economic viability of the project. This focus on local sourcing aligns with sustainable practices that prioritize minimizing environmental harm throughout the construction process.