A very nice concept, but utterly pointless.
- Why convert sunlight into chemical energy and then into electricity instead of doing so directly via photovoltaic panels? After all, at every energy conversion a part of the energy is wasted in the form of heat.
- Photosynthesis doesn't exactly create a huge amount of energy. In order to power a car AND let the plants feed themselves, you'd need a mobile rainforest.
- Plants breathe and evaporate water by doing so. In a glass car, things would get hot and humid, like in a rainforest.
- Here in Belgium, every inch of road is lit at night, so it would work here. But in most parts of the world, driving at night would be impossible without sufficient battery capacity.
- Keeping the soil full of nutrients and water sure is a lot of work...