Soon there will be no ice left to take probes from for comparison, this will cure the problem for some of the loudest critics of climate change
Seriously, there seems to be a problem – all crises of evolution (meaning a worldwide drop in species numbers) always followed a CO2 rise
*, regardless where the latter came from. You can measure this in deep drilling core probes of sediments, not only in ice.
We know where it comes from
now anyway. CO2 does not rise because of a worldwide temperature gradient, it used to be the other way round
But whether if we understand it or not, there is not enough done by research and limiting exhaust gases and we and the children will have to live with it. As i understand it it is too late to counter it now anyway.
* edit: With one exception: when the first O2-producing organisms arrived on the world's stage (making use of the overwhelming CO2-saturated atmosphere), the O2 created by them led to a mass extinction of anaerobic life, very early in earth's biological development. O2 was indeed a new and poisonous gas, for them.
In Jurassic times (you know T. Rex and all that) the O2 level was so high that insects with their trachoid respiration could reach enormous (compared to recent time) dimensions, along with other O2-respirating life.
Again: Rising levels of CO2 do not only generate more heat in earth's atmosphere, it is a direct threat to all O2-breathing life.