How does Valley Metro consider environmental impact in their operations?

Valley Metro considers environmental impact primarily by focusing on the reduction of traffic congestion and promoting the use of public transportation. This approach directly contributes to lowering greenhouse gas emissions and improving air quality. By encouraging more people to utilize light rail systems rather than driving personal vehicles, Valley Metro helps to decrease the overall number of cars on the road. This, in turn, leads to less congestion and reduced energy consumption associated with travel, supporting broader sustainability goals.

While the other options may contribute to environmental benefits in a broader context, they do not directly align with the core operational strategies of Valley Metro. Carpooling and planting trees are valuable practices but are not the central focus of their transportation strategy. Additionally, minimizing the number of trains in operation could lead to decreased service availability, which may discourage public transit use rather than promoting it. Therefore, the emphasis on public transport to mitigate traffic congestion is the most relevant to how Valley Metro addresses environmental concerns.