Light pollution is increasing globally, and having a negative impact on wildlife and humans. But the solutions are ...

National Highways said it was aware of problems in the area with street lighting and it was sourcing LED lights to replace older, sodium lanterns that it said were no longer being manufactured.

One viewer asked: Why is Tucson so dark? Can more street lights be added? City officials say there are multiple reasons for Tucson's dark streets. First, street lighting can be expensive to install.