The earth has been completely ice free for most of it’s existence... That’s something Al Gore and his worshipers won’t tell you when they advocate for taxation on the poor and middleclass to pay for wind turbines and solar panels.
Actually that is not quite true. To support an argument [i]against[/i] man made global warming, the earth has been in an ice age state as normal for 80% of the time, and warm only 20% of the time as a natural cycle. And even with human influence it is going to go back into a glacial cycle again soon, it is past due. And it will warm up after that once again.
But something does heat it up and bring it out of glacial cycles into interglacial cycles quite rapidly. These glacial/interglacial cycles correspond with solar insolation cycles, and orbit very well could be one influence of several at the same time such as polar shift along with precession that causes this very real cycle proven by Paleoclimatology.
With whatever influences that cause it, a natural long term climate change cycle is indeed real, man made “climate change” is not.