Aside from the trillions of dollars it would cost in gathering and launching the crap somehow into orbit, stuff which commercially is worth a lot for mining of valuable minerals, the stickiness of that microfine dust comes largely from electrostatic cling and charge if I remember right, meaning that it could end up clumping in orbit rendering it useless, even falling back to Earth then.
Especially foolish a risk considering that climate change can be beaten for free and safely, simply by people having far fewer kids for a few generations.