Go read a little Geology. We're in the Quaternary period/age; it's an Interglacial period. What's that mean? We're in the same ice age that's been going on well over 10's of thousands of years, and longer..millions of years... During our current, and long standing ice age, scientists have documented much warmer Interglacial periods than now, in this current period. They define an ice age, as when there is even 1 glacier that hasn't fully melted; in our time, those are the Greenland Ice Sheet, and the Antarctic Ice Sheet. There have also been times that Earth has been completely ice free, and habitable; hence the demarcation between different ice age periods.... Just saying.