Pretty low brow stuff right there. Scratch that. It's juvenile and just plain stupid.
You're going to compare trying to divert an asteroid, a single, one time event that has no further consequences once you've diverted it or blown it up (presumably with one of our magic imaginary weapons that could destroy a large asteroid) with tinkering around with a complex system where one change or a series of changes will then affect the entire climate system producing changes that we might or might not be able to predict and/or survive.
On display in this thread is the typical human arrogance that says we are in control, and that we have power over everything. We aren't, we don't, and we can't.
If we try to engineer the climate of this planet, it will be the final evidence that humans are the dumbest of the dumb, the only creatures on the planet that can't live in harmony with it.
For the last time (because I am out of the discussion), we should do everything we can to protect the environment, and then we should spend our money, time, effort, energy adapting to the changing planet. We should also be aggressively exploring ways to move some human civilization off the planet. Those three things are the most prudent ways humans can deal with climate change.