Well, that's true, of course. You could say the same thing about all the conversations in all the bars in North America right now, not to mention all the living rooms.

They have Zero impact. ;-)

But that won't stop people from enjoying their talk, will it?

The fact is, 99.999% of everything we ALL do has "zero impact" in the terms you mean...

Or it doesn't.

Depends whether you believe in the mass results of many little causes and effects or not.