Well done Flat_Accent, you beat me to it, apologists love to talk of the shortcomings of carbon 14 dating, and ignore the firm evidence given by other methods.
As to the " water conopy" no such thing could have existed after land based life began on Earth, for a variety of reasons, one being the air pressure below the canopy.
There is no evidence one ever existed as far as I know, but it certainly is just another element of the story of Noah's Ark that shows it to be total fiction.