Fact 1: Cutting down trees has a negative impact on an ecosystem.

Fact 2: If trees are cut or burned, the carbon is released back into the atmosphere.

Given the two facts above, answer the question "Releasing what can have a negative impact on an ecosystem?" with the following options: 
- disease
 - viruses
 - A virus
 - Carbon
 - tar
 - toxins
 - herbicide
 - vehicles


 

    Carbon     