Low emission zones are common throughout Europe and the UK, with over 250 protected European cities as of 2019. Though not as common in the United States, these EU cities provide a blueprint for the future of LEZs around the world.
The reasons for our dependence on fossil fuels, not only nationally, but globally, are clear to see. Fossil fuels are cheap to produce, abundant and reliable, and ultimately, have all the infrastructure in place to make production relatively easy.
Solar energy has grown rapidly in the past decade, reaching 97 gigawatts of capacity by 2020 (enough to power 18 million homes). Though only 11% of the renewable energy consumed in the US is solar, this figure is expected to more than double by 2050.
Regardless of the inefficiencies, hydrogen does have the advantage in terms of range, lightness, and quick refueling. The issues come with the process of actually getting the fuel source to the car without losing so much power.