“Solar Real Estate Is Hiding in Plain Site on Europe’s Rooftops”
Europeans can massively expand low-cost solar generation just by tapping the space over their heads.
That’s the conclusion of researchers who used satellite imagery, electricity prices and lending data to assess the untapped energy potential of Europe’s buildings. Rooftop area three times the size Luxembourg is available and could economically supply almost a quarter of the bloc’s power, according to a paper published in Elsevier’s October edition of Renewable and Sustainable Energy Reviews.
My Trip To The Amazon 
Solar energy is really great stuff. It’s not even so expensive as it used to be before. I’ve buyed few solar cells online and build my own backpack charger (instructions from the internet) this cost me almost nothing, and it becomes great at the end. I just love this kind of stuff