Resource List: Science
- January 2006 Phenomena
- America's Ten Most Endangered Rivers, 2006
- World's 30 Busiest Airports by Passengers and Cargo, 2005
- Earth Day by the Numbers
- Least and Most Polluting Cars, 2013
- Least and Most Polluting Cars, 2011
- Least and Most Polluting Cars, 2010
- Least and Most Polluting Cars, 2009
- Top-Selling Vehicles in the U.S., 2006
- Most Popular International Car Colors, 2005–2006
- Greenest Colleges in the U.S.
- Greenest Colleges in the U.S.
- Greenest Colleges in the U.S.
- Greenest Colleges in the U.S.
- Top Ten Greenest Colleges in the U.S., 2008
- The Top 10 Lowest Radiation Cell Phones 2012
- America's 25 Most Ozone-Polluted Metropolitan Areas, 2006
- America's 25 Most Ozone-Polluted Metropolitan Areas, 2013
- America's 25 Most Ozone-Polluted Metropolitan Areas, 2012
- America's 25 Most Ozone-Polluted Metropolitan Areas, 2011