ppm, with no let up (see link)...if we continue to burn FFs at our current rate, in 80 years the concentration will be TRIPLE what is was when those glaciers receded...btw, the estimated CO2 concentration during the last ice age was 180 ppm...does that not give you pause?
There is a momentum to these Climate Changes...CO2 takes a long time to be absorbed by oceans and the biosphere... some never comes out of the atmosphere, so we can never just 'flip a switch' make it all our troubles go away....we have to act now to minimize the damage.
Again...we'll be burning FFs to "keep the plane flying" for awhile...hopefully, not too long as we hopefully adopt a new worldwide energy strategy that includes Nuclear Power, Renewables and as little FFs as possible...as I've said before, China has over 220 nuclear plants in various stages of development, and Russia is operating the world's largest Fast Breeder Reactor...we need to get moving...hopefully, together.
I always have to put in this reminder...the EIA, BP and others, all say we have but 47 years of "Proven" oil reserves...and right now, we're reduced to having to squeeze it out of rocks...no one's stumbling across big pools of oil...(note that the Alaska drilling project is predicted to give the U.S. just 6 months of additional reserves)..."Un-proven" reserves 'might' increase those numbers by a factor of 3-6...but, we are not in "High Cotton" when it comes to oil, and we REALLY need it for other uses....unless you don't expect civilization to last all that much longer.
Link: https://climate.nasa.gov/climate_resources/24/graphic-the-relentless-rise-of-carbon-dioxide/