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

Fact 2: Incineration is harmful to the environment, it pollutes.

Given the two facts above, answer the question "What impact does incineration have?" with the following options: 
- heat
 - neutral
 - friction
 - mechanical
 - harmful
 - good
 - ligt
 - positive


 

     harmful    