Answer: Farming
Explanation: Plowing the land is the first source of wealth.
1. The sun
2. Chemical energy
3. Photosynthesis
4. Store
5. release
6. Cellular respiration?
Last one I'm not 100% sure.
I just looked it up, it's carbon!
Overpopulation can lead to overuse of resources, extreme pollution, war, plague, starvation, and many more serious world problems