Wildlife crossings. We see the signs for them on the side of the highway, prompting small children (or those who don't know any better) to ask, "How do the animals know to cross here? They can't read."
Wildfires, an annual problem here in Montana. Seemingly every summer, fires burn up half the state, and some years that's less of an exaggeration than we'd all prefer. We're aware of how the fires cause air quality to take a nose-dive, but what about our water quality?