While new, greenfield smart cities are being planned and started in the Middle East, old cities in Europe are seeking ways to retrofit to be smarter, too. And when we say “old” we mean more than 1,000 years old. Noted as early as 1051 in the Anglo-Saxon Chronicle, the port city of Bristol in England was a critical trading and ship building center. Unfortunately, it was also known for less respectable trade: Edward Teach, better known as Blackbeard the pirate, was allegedly born in the city in the 1700s. Like all cities, Bristol is undergoing a transformation. Today, it is becoming a model for another type of trade: trading legacy systems for climate-friendly ones. Ameresco, Ltd ., an integrator based in Framingham, Mass. that specializes in energy efficiency and renewable energy, has been selected as a partner in the Bristol City Leap project , a 20-year program to decarbonize the city. City Leap has the potential to facilitate a major change by use of real time data,...