system
Given the following post, respond as if you're commenting on Reddit:
human
How does the excess salt from salting roads affect the environment? Things such as bodies of water or soil quality?
gpt
Seattle and Portland have actually found that this is a huge problem. Salmon return to the same area every year to make babies, and they guide themselves by the gradient of salt to fresh water as they move upstream. When there is too much salt from the roads, they get lost and spawn in the wrong place so their babies die too, leading to population decline, which is obviously terrible for the salmon industry. 

AFAIK they use some non salt alternatives that don’t work as well to protect the salmon.