Well, aside from the numerous meteors that are hurtling in our planets direction right now, the fact that there will be a major pole shift december 21, 2012, and the fact that greenhouse effect will melt the polar icecaps if not fully stopped in the next XX years, flooding most of the earth, the supervolcanoes that can spring up at any time, and the moving plates that crash violently into eachother, yeah, we are in complete control. (OVERUSE OF COMMAS)
Numerous Meteors...do you really think the Chinese and American governments will let any major ones destroy us? We'll crush them.
Greenhouse effect...is actually NATURAL...us speeding it up isn't gonna do much. We're over due for an ice age already, and the Green House effect will only speed it up. Check the gulf stream and what not, it will shut down once the temperature gets so high, and then the temperatures will plummet. Who cares if the world floods....we'll just either do what the dutch did, or build underwater or underground, or on the water.
Super volcanoes - likelyness of one coming up = 0...or there abouts. Stop watching Hollywood movies is my advice. We'll just deal with them as they come, we're building bigger and better machines, huge explosions will do most of the work for us, cutting paths for the lava to reach the oceans.
The moving plates that crash into each other. Tectonic Plates you mean...yeah...go have a look at the Japanese and how they ride through most of the earthquakes. The San Andrea's was unfortunate, and so was the Tsunami, pity about that, wouldn't have been so much damage if it wasn't for the tourists. *shrug* But even that we can deal with. Erect huge walls, explosions to disrupt the Tsunami and break it. There are numerous things we can do in this day and age.
Sure they might not be in our control, but we've adapted so that they can no longer affect us as such. Sure it was the most damaging disaster on record, however, the damage was made worse by cutting down the mangroves. That was our fault...we cut them down.
But the Magnetic Polarity....I pity the people with pace makers...XD.
But if all that did happen at once Bio, half of it would negate the other. Therefore making it ineffective.