Anyway, apart from the CO2 expenditure in the plane itself we enjoyed this always interesting city. And even I photographed a small surprise: this carbon neutral advertisement about central London (I think there is another one about the Olympic games). I do not know exactly what it refers to, neither the veracity of the carbon neutrality, but, in any case, I consider quite positive this kind of presence in the city of London. It is at the same time a good sing and an educational thing. Would something similar be possible in Wall Street? Or When it will be likely?