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, what impact does incineration have?

pick from the following.
(i). heat;
(ii). neutral;
(iii). friction;
(iv). mechanical;
(v). harmful;
(vi). good;
(vii). ligt;
(viii). positive;
Answer:
(v).