Read this, and then think about this quote from that news story:
Gamma ray bursts would also trigger smog formation that could blot out sunlight and rain down acid. However, at 8,000 light-years away, "there's probably not a large enough effect there for much of a darkening effect," Melott estimated. "It'd probably cut off 1 or 2 percent of total sunlight. It might cool the climate somewhat, but it wouldn't be a catastrophic ice age kind of thing."
No. I am not going to blog about global warming. You can't make me.