Cities around the world could spend as much as $41 trillion on smart tech over the next 20 years.
"But, but, where will the money come from?"
That's going to take a whole lot of electricity, too.
That's going to take a whole lot of electricity, too.
Building the city of the future — at a $41 trillion price tag
Aneri Pattani, special to CNBC.com
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