Which of the following C40 initiatives targets sustainable transportation?

The Clean Air Cities Initiative focuses on reducing air pollution and enhancing public health in urban areas. One of its key components includes promoting sustainable transportation options, which aim to decrease reliance on fossil fuel-powered vehicles, thereby improving air quality. By encouraging the use of public transit, cycling, and walking, the initiative seeks to implement transport solutions that are environmentally friendly, thus directly aligning with the goals of sustainable transportation.

The other initiatives listed, while important for sustainability, do not specifically target transportation in the way that this initiative does. For instance, the Efficient Energy Program focuses on optimizing energy use in buildings and industries rather than transportation systems. The Green Transportation Network could imply sustainable transport, but this specific initiative is not among the well-known C40 programs. Lastly, the Carbon Neutral Cities Initiative encompasses a broader range of sustainability efforts, including energy and waste, without specifically narrowing its focus to transportation alone.