The earth did, but humans did not. During the Permian when most of this carbon was deposited the earth was much warmer than today, mostly desert and tropical which insects as large as birds flying about. It was not an earth that humans in our present evolution would do well on, much of our existing agriculture would fail or have to move. The problem that people who think "warm is good" ignore is that life adapts when these changes happen over millions of years, but right now we are forcing millions of years of change in a century. Thats why the arctic is melting, species are going extinct at record rates, every year brings record floods, drought and other natural disasters worldwide.