Final answer:
The paper factory proposal (Proposal #2) might have positive effects on the river due to its water usage and restoration process.
Step-by-step explanation:
Proposal #2 - The paper factory might have positive effects on the river. The factory would use water from the river in its operations and then either release it back into the river as clean, warm water or distribute it into the air as steam. This process of using and restoring water can contribute to maintaining the water quality and ecosystem of the river. Therefore, Proposal #2 could have positive effects on the river.