I have read what I could on the mini-comets' bombardment of Earth, and (without my doing any real scientific analysis) I have to say that I still have a hard time believing such a wide-spread amount of conglomerated matter is doing such a thing. I make this statement based on the VERY high number of man-made satellites up in orbit, and the knowledge of what happens to one of them when even a tiny micro-meteor is believed to hit something like a large solar array panel -- there's a VERY noticable attitude disturbance on the spacecraft!