I am really enjoying reading these posts!

A small issue:

"~The is a constant disintegration in the radiocarbon but new 14C atoms, immediately absorbed by the living organism, are produced equally fast. The ratio between 14C and 12C in a living organism thus remains constant."

Strictly speaking, the 14C in the atmosphere is decaying at the same rate as 14C in organisms, and this is why living organisms have the same ratio of 12C/14C as the current atmosphere. If the ratio in the atmosphere changes (and it is changing), then living organisms maintain that same ratio, not a constant ratio.

Thanks!