Final answer:
Deforestation is not a pollutant, but rather a process of habitat destruction and does not fit the definition of a pollutant like pesticides, oil spills, and carbon dioxide emissions.
Step-by-step explanation:
The question asks which of the options is NOT an example of a pollutant disturbing the balance of an ecosystem. Pesticides, oil spills, and carbon dioxide emissions are all examples of pollutants. However, deforestation is not a pollutant; rather, it is a process of habitat destruction that leads to loss of biodiversity. While deforestation is a significant environmental threat and does contribute to the loss of ecosystems and the species that inhabit them, it is not a chemical or physical introduction into the environment like the other options listed. Therefore, deforestation does not fit the definition of a pollutant.
It is important to understand the difference between pollutants and other forms of environmental threats to properly address conservation efforts and strategies.