Strange that you are so damned ignorant.
The ice core record, from the Antarctic, go back accurately, about 650,000 years. There are cores being studied right now that will extend this a bit further. However, at no time in that period has the CO2 been above 300 ppm, nor CH4 above 1000 ppb. We are above 385 ppm of CO2 right now, with 1800 ppb of CH4. On top of that we have introduced many millions of tons of industrial GHGs, some of which are 10,000 to 20,000 times as effective GHGs as CO2.
We are past the equivelant of 450 ppm of CO2.
Science: CO2 levels haven’t been this high for 15 million years, when it was 5° to 10°F warmer and seas were 75 to 120 feet higher — “We have shown that this dramatic rise in sea level is associated with an increase in CO2 levels
You would have to go back at least 15 million years to find carbon dioxide levels on Earth as high as they are today, a UCLA scientist and colleagues report Oct. 8 in the online edition of the journal Science.
“The last time carbon dioxide levels were apparently as high as they are today — and were sustained at those levels — global temperatures were 5 to 10 degrees Fahrenheit higher than they are today, the sea level was approximately 75 to 120 feet higher than today, there was no permanent sea ice cap in the Arctic and very little ice on Antarctica and Greenland,” said the paper’s lead author, Aradhna Tripati, a UCLA assistant professor in the department of Earth and space sciences and the department of atmospheric and oceanic sciences.