Bioremediation

The correct option is "usage of microbes to destroy environmental pollutants".

Detailed Explanation:

1. Understanding the Etymology:
The term "bioremediation" is derived from two words: "bio" (relating to living organisms, particularly microorganisms like bacteria, fungi, and algae) and "remediate" (which means to solve a problem, correct a fault, or clean up). Therefore, at its core, bioremediation literally means using life to clean up or restore a contaminated environment.

2. How Bioremediation Works:
Environmental pollutants—such as oil spills, heavy metals, pesticides, plastic-related chemicals, and industrial solvents—can be toxic to ecosystems. Microorganisms naturally possess diverse metabolic pathways that allow them to consume or break down organic compounds. In bioremediation, scientists harness these natural digestive processes. The microbes feed on the pollutants, breaking down complex toxic molecules into simpler, non-toxic substances like water ($H_{2}O$) and carbon dioxide ($C{O}_2$).

3. Evaluating the Options:
- "usage of microbes to create new organisms": This refers more to genetic engineering or synthetic biology rather than cleanup/remediation.
- "usage of aerobic bacteria to create new vaccines": This describes a process in pharmaceutical biotechnology and immunology.
- "usage of anaerobic bacteria to create new antibiotics": This describes antibiotic production/drug discovery in microbiology.
- "usage of microbes to destroy environmental pollutants": This aligns perfectly with the definition and purpose of bioremediation, which is to neutralize, destroy, or remove contaminants from soil, water, and air using biological agents.