>>13135006Probably not. Not only is the geologic evidence for it scarce and inconsistent, but the Younger Dryas consisted of several smaller cooling periods and meltwater pulses. If it was an impact, we'd expect the effects to have occurred all at once.
>crater in GreenlandThe proposed impact structure in Greenland currently remains undated and could be as much as 2 million years old. It's unlikely to be responsible.
There is still a possibility, but it's a very, very small one.
