Which alternative energy storage method sounds more promising?

The four choices are:

1. Graphene Based Ultracapacitors
2. Urea as a hydrogen carrier for fuel cells or Internal Combustion Engines
3. Rechargeable Metal Air batteries
4. Other – got your own idea

It would be nice if you could also explain why you think that energy storage method is more promising than the rest.
The use of the energy storage is mobile, such as vehicles.

How do you like these green building ideas?

I think they should make new building codes that incorporate all these ideas into new building codes

solar panels
wind generators
passive ventilation
rainwater collection
super glass
geothermal heating pumps
solar heating
eaves
compact florescent bulbs

There are building codes that require all buildings to have bathrooms and fire exits. You can no longer have an outhouse and just one door. If buildings have to abide by those standards, then there is no reason why they shouldn’t abide by these in my book. What do you think?

i wanna get a grow light out in the woods where theres no outlets. is there away i can power these remotely?

i cant afford to wire a line directly from my house.
a portable generator makes sense. would i need to take it inside to charge it or would it or would it have its on battery? how long could i expect this to last? and if thee are helicoptes flying around they already know i’m growing

i need to know where i can get the best combination of a pv system and there ratings.?

i need the best;inverters,solar panels, VRLA batteries to use to get maximum result needed. please specific refrences will be appreciated.