The year is 2080, we solved the climate crisis, we solved the poverty crisis. You live in a pretty chill solarpunk utopia that is considerate, sustainably, just and generally safe. The few dangerous places out there are clearly labelled.
Choose one of those signs and explain why it is displayed where it is.
EDIT: for some reasons up/downvotes do not work for me here. Is anyone having similar problems?
While identifying them explicitly is dangerous, they can be detected by the negative. We can also determine something about their effects, if we are careful. Unfortunately it's akin to identifying a minefield by poking it.