In 2016 humans added ~10 billion tons of CO2 and other greenhouse gases to the atmosphere from burning fossil fuels:
https://www.epa.gov/ghgemissions/global-greenhouse-gas-emissions-data#Trends

But I do agree with you that human burning of fossil fuels was not responsible for the warming at the end of the last ice age. But do you suppose that there just might be some things that have changed since then? Like, maybe  the industrial revolution?  Like burning huge amounts of carbon rich fossil fuels that have been stored away for 60 million years or more? Like burning those fossil fuels and  releasing billions of tons  of CO2 and other greenhouse gases into the atmosphere? Like increasing the concentration of CO2 in the atmosphere from about 280 ppm (parts per million) to today's over 400 ppm?