On Thursday, 6 March 2014 20:50:23 UTC, John Hall wrote:
In article ,

Lawrence Jenkins writes:

snip

Could it be that 80ppm that humans have put into the atmosphere

has reached a saturation point where it no longer has any effect

on catastrophic warming.



I think that the short answer is: no, it couldn't.

--

John Hall "He crams with cans of poisoned meat

The subjects of the King,

And when they die by thousands G.K.Chesterton:

Why, he laughs like anything." from "Song Against Grocers"

So its a linear process doubling co2 twice the effect.