| web | https://www.colorado.edu/ecenter/2021/04/15/hidden-damage-landfills#:~:text=The%20United%20States%20has%20over%203%2C000%20active%20landfills%20and%2010%2C000%20closed%20landfills. |
| author | Kayla Vasarhelyi |
| publication | University of Colorado Environmental Center |
| date | 2021-04-15 |
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