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They're a little cagey about exactly where the crossover point lies relative to the likelihood of devastating effects on the planet.
Wikipedia (Near-Earth Supernova) says that a 25 ly away supernova would wipe out half the ozone layer so that's probably the lower bound for what we want
Geez, how many stars do we have that close to us?
I like this one... Because I understood it!!!! Plus it's funny.
When I don't understand them, I'll sometimes check out explainxkcd.com .
Astronomer on a planet just a little too close: "This is a cool way to die"