Actually a very promising alternative to electric vehicles is cars that run on ammonia (nh3) with a few modification a diesel-car can run on it, the rest-product of burning nh3 is nitrogen and water. and the energy density is higher than gasoline. the main problem is the production ammonia is one of the largest productions in the world(for e.g. fertilisers ) but the process is dependent on fossil fuel(Haber -Bosch process) - however recently, teams of researchers at DTU in the copenhagen region, managed to make ammonia using processes similar to what happens in plants without the use of fossil fuel. Currently they are working on scaling up the production and since there is already a market for ammonia there is commercial interest in the project. one of the nice things about this is that it can then also be used as a means to store surplus energy from windmills or solar power, thus eliminating the problem with fluctuations in the amount of energy available. I really think anyone interested in renewable energy sources should look into this. here is a short paper on the subject (unfortunately only in danish, but i believe an autotranslator could give a fair result) https://ing.dk/artikel/pilotanlaeg-skal-teste-produktion-groen-ammoniak-213941