（Purely personal perceptions, not necessarily correct ！）

According to the estimation of Hedges & Company, a market data analysis organization, there are about 1.446 billion cars in the world, and even if the scrap rate is 3%, more than 40 million cars are scrapped every year.

According to the report released by the British Automobile Manufacturing and Sales Association, in 2018, every car produced by British automobile manufacturers consumed an average of 2,210 kWh of electricity, 2.8 cubic meters of water and about 0.51 tons of carbon emissions. But from the perspective of car use, the average carbon emission of new cars with small emissions in the British market in 2018 is 12.45 kg/100km.

The mileage is calculated as 10,000 kilometers per year, and the fuel consumption is calculated as 8 liters per 100 kilometers. Each new car consumes 800 liters of fuel, about 0.58 tons, and emits 1.245 tons of air pollutants. However, motor vehicle emissions contain more than 100 kinds of substances that have been proved to be carcinogenic. More seriously, motor vehicle emissions belong to low-altitude pollution, which has a direct impact on human health.