Answer:
The right response is "fossil fuels".
Step-by-step explanation:
- Fossil fuels such as coal as well as oil conduct electricity that has already been photosynthesized by vegetation or plant species from the ecosystem for thousands of generations.
- Within only several hundred years we've returned fuel to that same ecosystem or environment, the sources of CO₂ rise are fossil fuels.
However, the above solution is the right one.