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Rules: it has to sound moderately plausible. And debating "no that won't work b/c of blah blah blah" is no fun. Instead, suggest changes to help. We're all about productivity here.
To get the ball rolling: build another version of the large hadron collider in space, then, when it starts making black holes, throw it into the sun. Nothing says apocalypse like the sun dying.
No Intarwebs would either equal doomsday, or massive social liberation.
Ha, my cousin plans to build a huge fleet of zepplins that play Breathe by Prodigy as he nukes the cities of the world. I'm just hoping he's not serious. (Though that song would be fitting for nuking cities :-) )
Stockpile thermite. When sufficient mass is achieved, ignite the lot and burn a hole through the earth's crust. The resulting supervolcanic eruption should end civilization.
obesity becomes the new norm. everyone gets so fat they can't walk around, global production grinds to a halt. Nobody can remember how to hunt or farm since its so long since our sedentary society has engaged in such primitive practices.
the irony is that we all die of starvation in the aftermath of our obesity. slow acting doomsday.
Stockpile thermite. When sufficient mass is achieved, ignite the lot and burn a hole through the earth's crust. The resulting supervolcanic eruption should end civilization.
Excellent. Classic Dr. Evil. You'll probably need to keep pumping oxygen into the area to make sure it stays on fire.