Whatever happened to the concept of hydrogen-run cars? Surely we are many moons away from being able to have electric cars for everyone.
Hydrogen (from what I’ve read) is renewable with the only thing being emitted being water.
As said only what I’ve read but at face value looks the most promising.
And where do you suppose the Hydrogen is going to come from? Ok Hydrogen and Helium are the most common elements in the universe, but on Earth it's all tied up in other compounds - like water, or trees, or coal. To extract the Hydrogen requires energy - much more energy than you can get back by re-burning the extracted Hydrogen. Perpetual motion machines don't exist. It's much easier to extract energy (burn) from stuff like natural gas, oil, or coal because it comes out of the ground basically ready to go.
So at best you are moving the pollution from the point of fuel consumption (cars driving around cities) to the point of energy generation (power stations). If you can generate enough clean energy (solar, wind, hydro, thermal) to split enough water into H2 and O then fine it may work. But we're a long way from that at the moment.