# Environmental Impact

* **Reduction in Carbon Emissions**: Walking instead of driving can significantly reduce carbon emissions. If people replaced just one short car trip per week with walking, it could cut **2.4 million tons** of CO2 emissions annually in the United States alone. Globally, that number would be much higher.
* **Energy Efficiency**: Walking is one of the most energy-efficient forms of transportation. It requires **zero fossil fuels**, and for every mile walked instead of driven, an individual saves about **411 grams of CO2**.
* **Sustainable Cities**: Cities designed with pedestrian-friendly spaces can improve both the environment and public health. In Copenhagen, where **37% of people walk or bike to work**, CO2 emissions have been reduced by **20%**, and air quality has significantly improved.