It could harm birds that fly into it, it can take up space and disturb an animals habitat, and i cant think of another but i tried :)
The answer is, b. other substances
The answer is Greenhouse gases
Greenhouse gases absorbs and emit radiation within thermal infrared range . This process create a condition which commonly known as the greenhouse effects, keeping the earth at a moderate temperature.
Answer:
A drop in the birthrate
Explanation:
This wouldn't really be an increase because if the birthrate drops in, lets say, africa, there wouldn't be an increase in immigration.
Hope this helps!!