A.I. Explanation:

Option 1: "To introduce a new public transport system"

Explanation: While the Greenway Project does involve the introduction of electric buses, the primary goal is not solely about creating a new public transport system. The text emphasizes reducing carbon emissions as the main objective, making this option too narrow and not fully representative of the project's overall aim.

Option 2: "To increase the town's green spaces"

Explanation: Although the project includes planting 2,000 new trees, which contributes to green spaces, this is not the primary goal. The main focus of the Greenway Project is on reducing carbon emissions by 30%, making this option incomplete and not aligned with the text's main idea.

Option 3: "To encourage businesses to adopt green practices"

Explanation: Encouraging businesses to adopt green practices is part of the initiative, but it is not the primary goal. The text clearly states that the main aim is to reduce carbon emissions by 30%, thus making this option too specific and not reflective of the overall objective.

Option 4: "To reduce carbon emissions by 30% over five years"

Explanation: This option accurately reflects the primary goal of the Greenway Project as stated in the text. The initiative aims to reduce carbon emissions by 30% over the next five years, which is the central theme of the project. This goal is explicitly mentioned, making it the correct answer.