Fact 1: Landfills have a negative impact on the environment.

Fact 2: Most municipal trash is disposed of in such landfills.

Given the two facts above, answer the question "What mostly has a negative effect on the environment?" with the following options: 
- pure water
 - deforestation
 - animals
 - cigarettes
 - municipal trash
 - pure oxygen
 - smoking tobacco
 - chlorofluorocarbons


 

     municipal trash    