Nanotechnology and Alternate Energy

Can nanotechnology be good for climate? by ZDNet's Roland Piquepaille -- The UK's Department for Environment, Food and Rural Affairs (Defra) has recently released a long report stating that nanotechnology might offer hope for climate change. This study has focused on 5 specific areas: fuel additives, solar cells, the hydrogen economy, batteries and insulation. The conclusion of this report is that nanotechnology could contribute to reduce greenhouse gas emissions by up to 20 per cent by 2050. The largest reduction would come from using hydrogen as a source of energy. Unfortunately, this might be very difficult and will take years.

I am thinking on this... I wonder how far we can go with extracting the energy given to us from the sun. I wonder how we can get solar arrays on top of every building and embedded in every vehicle in the world as soon as possible, I wonder how we should start to change and how fast it can be done.