New energy vehicles, such as electric vehicles and hydrogen fuel cell vehicles, can play an important role in promoting a sustainable energy transition. Here are some main ways:

1. Reduce dependence on fossil fuels: New energy vehicles use electricity or hydrogen as a power source instead of traditional gasoline or diesel. This helps reduce dependence on fossil fuels, thereby lowering greenhouse gas emissions.

2. Improved energy efficiency: Electric vehicles and hydrogen fuel cell vehicles are generally more energy efficient than internal combustion engine vehicles. This means they can travel greater distances with less energy, reducing overall energy consumption.

3. Cooperate with renewable energy: New energy vehicles can be used in conjunction with renewable energy such as solar and wind energy. For example, electric cars could be charged at solar or wind power stations, further reducing carbon emissions.

4. Energy storage and grid stability: Electric vehicle batteries can act as energy storage systems to help balance grid loads. Charging when demand is low, such as at night, and then feeding power back to the grid when demand is high or supply is low helps stabilize the grid and optimize the use of renewable energy.

5. Promote technological innovation and economic growth: The development and popularization of new energy vehicles have promoted technological innovation, created employment opportunities, and contributed to economic growth. At the same time, it also promotes the construction of related infrastructure (such as charging stations and hydrogen fuel supply facilities), further promoting the transition to sustainable energy.

6. Promote policy changes: The popularity of new energy vehicles has also promoted policy changes. Many countries and regions have instituted plans to ban the sale of internal combustion engine vehicles and offer incentives, such as tax incentives and subsidies, to purchase new energy vehicles. These policies can help accelerate the transition to sustainable energy.

7. Environmentally friendly: New energy vehicles not only reduce carbon emissions, but also reduce air pollution. Electric vehicles and hydrogen fuel cell vehicles do not emit exhaust during operation, which has important implications for improving urban air quality and reducing health problems, especially in cities with heavy traffic.

8. Low life-cycle carbon emissions: While the carbon footprint of producing an electric vehicle may be higher than that of a conventional car, the carbon footprint of an electric vehicle over its entire life cycle is much lower than that of an internal combustion engine vehicle. This is because electric vehicles have extremely low carbon emissions during operation, especially when the electricity comes from renewable sources.

9. Promote the transformation of energy structure: The popularization of new energy vehicles will promote the transformation of energy structure, from fossil fuels to renewable energy. This will contribute to energy security and reduce dependence on external energy supplies, while also helping to reduce energy price volatility.

10. Promote circular economy: The batteries of electric vehicles can be recycled and reused at the end of their service life, which helps to form a circular economy and reduce waste of resources.

Overall, new energy vehicles are an important tool to drive a sustainable energy transition, they help reduce greenhouse gas emissions, increase energy efficiency, and integrate with renewable energy systems. New energy vehicles have played an important role in promoting sustainable energy transition, they not only help reduce greenhouse gas emissions and improve energy efficiency, but also drive technological innovation, policy changes and economic growth.