From the February 2008 Popular Science article “America’s 50 greenest cities”

Rankings’ methodology:
Popular Science gathered raw data from the U.S. Census Bureau and the National Geographic Society’s Green Guide, which contained survey data and government statistics, for American cities with more than 100,000 population, in more than 30 categories, including air quality, electricity use and transportation habits. The information then was compiled into four categories; each was given 5 or 10 possible points. Cities were ranked according to the sum of the four scores.
The categories and points assigned along with Popular Science’s description of each:

  • Electricity (E; 10 points): Cities score points for drawing their energy from renewable sources such as wind, solar, biomass and hydroelectric power, as well as for offering incentives for residents to invest in their own power sources, like roof-mounted solar panels.
  • Transportation (T; 10 points): High scores go to cities whose commuters take public transportation or carpool. Air quality also plays a role.
  • Green living (G; 5 points): Cities earn points for the number of buildings certified by the U.S. Green Building Council, as well as for devoting area to green space, such as public parks and nature preserves.
  • Recycling and green perspective (R; 5 points): This measures how comprehensive a city’s recycling program is (if the city collects old electronics, for example) and how important its citizens consider environmental issues.

How Fort Worth landed 15th place
— Electricity: 8.3
— Transportation: 4.6
— Green Living: 2.4
— Recycling/Perspective: 4.4
— Total: 19.7 points

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