"A subfamily Homininae (the "hominines") is used to refer specifically to the African apes; chimps gorillas and humans, which separated evolutionarily from the Asian apes around 13 million years ago."
http://www.mnh.si.edu/anthro/humanorigins/ha/early.html

"Among the oldest known hominoids is a group of primates known by its genus name, Proconsul. Species of Proconsul had features that suggest a close link to the common ancestor of apes and humans—for example, the lack of a tail. The species Proconsul heseloni lived in the trees of dense forests in eastern Africa about 20 million years ago. An agile climber, it had the flexible backbone and narrow chest characteristic of monkeys, but also a wide range of movement in the hip and thumb, traits characteristic of apes and humans.
http://encarta.msn.com/encyclopedia_761566394_2/Human_Evolution.html

"In the last 600 million years of Earth's history only the Carboniferous Period and our present age, the Quaternary Period, have witnessed CO2 levels less than 400 ppm."
http://www.clearlight.com/~mhieb/WVFossils/Carboniferous_climate.html
And:
"There has historically been much more CO2 in our atmosphere than exists today. For example, during the Jurassic Period (200 mya), average CO2 concentrations were about 1800 ppm or about 4.8 times higher than today. The highest concentrations of CO2 during all of the Paleozoic Era occurred during the Cambrian Period, nearly 7000 ppm -- about 19 times higher than today."

Finally I said "When humans were apelike creatures CO2 levels were about twice the current levels and Earth was much warmer"
I said nothing about Ape like creatures being in the Carboniferous.