What percentage is the cars giving out of pollution?

Cars are responsible for approximately 29% of total greenhouse gas emissions in the United States, primarily due to carbon dioxide from fuel combustion. The percentage can vary by country and region, depending on factors like transportation infrastructure, fuel types, and the prevalence of electric vehicles. In urban areas, cars contribute significantly to air pollution, including particulate matter and nitrogen oxides. Overall, the impact of cars on pollution underscores the need for cleaner transportation alternatives.