Driving, especially in personal vehicles, emits significant amounts of greenhouse gases, including carbon dioxide, due to the combustion of fossil fuels.

Carbon dioxide (CO2) is the main greenhouse gas produced by transportation, primarily due to the burning of fossil fuels in vehicles.

China is currently the world's largest emitter of transportation-related greenhouse gases, primarily due to its large population and increasing number of vehicles.

Decarbonization refers to the process of reducing or eliminating carbon emissions from transportation, often achieved through the use of alternative fuels, electric vehicles, and energy-efficient technologies.

Expanding highways generally leads to increased vehicle usage and emissions, while the other options aim to reduce transportation-related emissions.

Climate change refers to the long-term alteration of temperature and typical weather patterns in a place due to human activities, primarily the emission of greenhouse gases.

Trains generally have a lower carbon footprint per passenger-mile compared to other modes of transportation due to their energy efficiency and ability to carry more passengers.

Electrification refers to the process of converting vehicles to run on electricity, often through the use of electric motors and batteries.

Gasoline is a traditional fossil fuel, while hydrogen, biodiesel, and natural gas are alternative fuels that can potentially reduce emissions.

Transportation Demand Management (TDM) refers to strategies aimed at reducing the need for travel, such as promoting carpooling, remote work, and mixed-use development.

Transportation-related emissions generally contribute to air pollution and poor air quality, while the other options are potential consequences of climate change.

Carbon Capture and Storage (CCS) refers to technologies that aim to capture carbon dioxide from transportation sources and store it underground or utilize it for other purposes.

Reducing transportation-related emissions generally leads to improved air quality and reduced traffic congestion, while the other options are potential benefits.

Life Cycle Assessment (LCA) is a method used to evaluate the environmental impact of a product or service throughout its entire life cycle, including transportation-related activities.

Expanding highways generally leads to increased vehicle usage and emissions, while the other options aim to promote sustainable transportation.