Where are the trees? Not Paris, new 'Green View Index' finds

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  • FILE - In this June 30, 2005, file photo, trees are reflected in still water on the Esplanade along the Charles River in Boston. A Massachusetts Institute of Technology project called Treepedia, that maps trees in the world's major cities, is making it easier to determine where more green is needed. Trees play a critical role in urban environments, helping keep cities cool, mitigating air and noise pollution and just making them more pleasant places to live and work. (AP Photo/Michael Dwyer, File)

    FILE - In this June 30, 2005, file photo, trees are reflected in still water on the Esplanade along the Charles River in Boston. A Massachusetts Institute of Technology project called Treepedia, that maps trees in the world's major cities, is making ... it easier to determine where more green is needed. Trees play a critical role in urban environments, helping keep cities cool, mitigating air and noise pollution and just making them more pleasant places to live and work. (AP Photo/Michael Dwyer, File) (The Associated Press)

  • FILE - In this Oct. 17, 2014, file photo, a woman rides her bicycle across a bridge over Prinsengracht canal in front of autumnally colored trees in the center of Amsterdam. A Massachusetts Institute of Technology project called Treepedia, that maps trees in the world's major cities, is making it easier to determine where more green is needed. Trees play a critical role in urban environments, helping keep cities cool, mitigating air and noise pollution and just making them more pleasant places to live and work. (AP Photo/Margriet Faber, File)

    FILE - In this Oct. 17, 2014, file photo, a woman rides her bicycle across a bridge over Prinsengracht canal in front of autumnally colored trees in the center of Amsterdam. A Massachusetts Institute of Technology project called Treepedia, that maps ... trees in the world's major cities, is making it easier to determine where more green is needed. Trees play a critical role in urban environments, helping keep cities cool, mitigating air and noise pollution and just making them more pleasant places to live and work. (AP Photo/Margriet Faber, File) (The Associated Press)

  • FILE - In this Aug. 21, 2012, file photo, tourists make pictures under tropical palm trees in Singapore. A Massachusetts Institute of Technology project called Treepedia, that maps trees in the world's major cities, is making it easier to determine where more green is needed. Trees play a critical role in urban environments, helping keep cities cool, mitigating air and noise pollution and just making them more pleasant places to live and work. (AP Photo/Wong Maye-E, File)

    FILE - In this Aug. 21, 2012, file photo, tourists make pictures under tropical palm trees in Singapore. A Massachusetts Institute of Technology project called Treepedia, that maps trees in the world's major cities, is making it easier to determine ... where more green is needed. Trees play a critical role in urban environments, helping keep cities cool, mitigating air and noise pollution and just making them more pleasant places to live and work. (AP Photo/Wong Maye-E, File) (The Associated Press)

A Massachusetts Institute of Technology project that maps trees in the world's major cities is making it easier for city officials and citizens to figure out where more green is needed.

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The project, called Treepedia, uses Google Street View to create what the MIT team calls the Green View Index.

Carlo Ratti, director of MIT's Senseable City Lab, says trees play a critical role in urban environments. They help keep cities cool, mitigate pollution and flooding and just make the environments more pleasant places to live and work.

The website gives birds-eye views of 15 cities, with trees represented by green dots. Users can zoom into a neighborhood or street to see ground-level images.

The project plans on adding many more cities, making it easier to compare and share information.