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PORTLAND -- A new study ranked Portland, San Francisco and Seattle as the three greenest cities in the U.S.

The trio earned the accolades for current sustainability programs and future plans as well.

Researchers at Tuft's University worked with a Canadian media company to run the study.

Unlike previous sustainability rankings, this study focused on the efforts the cities are making and not just the results.

Portland, Seattle and San Francisco tied for the top spot. Denver and Albuquerque rounded out the top 5.

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