Why is diesel fuel not harmful to the environment?

Diesel fuel is often considered less harmful to the environment than gasoline due to its higher energy density and efficiency, which can lead to lower carbon dioxide emissions per mile traveled. Additionally, modern diesel engines are equipped with advanced emission control technologies, such as particulate filters and selective catalytic reduction, which significantly reduce harmful pollutants like nitrogen oxides and particulate matter. However, it's important to note that diesel combustion can still produce harmful emissions, and the overall environmental impact can vary based on factors such as engine technology and fuel quality.