Father of global warming admits that that the earth has been warmer before

Even James Hansen, sometimes called "father of global warming" must admit that there were times when the earth was much hotter than now:

The narrative since that day in 1988 is that Earth is entering a dangerous warm era created by man’s carbon dioxide emissions. Every heat wave, cold snap, drought, hurricane, heavy snow, torrential rain, and change in sea level has been supposedly caused by man. And all are allegedly unprecedented events.
Except they’re not. It’s been warmer, and extreme weather has visited us before, all in a time long before man began to drive cars and operate power plants that helped move him from an almost primitive existence to a modern one.
Hansen has even admitted this.
“The last interglacial period, 120,000 years ago, that’s the last time it was warmer than today, sea level was 6 to 9 meters higher,” he said in an interview with online magazine Yale Environment 360.
So it has been warmer, and sea levels have been higher. And those conditions were entirely natural. Yet the alarmists want us to believe that the predicted warmth of today — which has yet to occur — is man-caused. How do they know? And why do they never mention that we are leaving the Little Ice Age and entering another interglacial period, an era that should be warmer as we gain distance from the cold period?
The Watts Up With That blog points out another hole in the narrative: While implying that we’re headed for another 6-to-9-meters increase in sea level in the coming — or just-arrived — interglacial period, “Hansen failed to say” that “paleoclimatological studies have indicated that it took a number of millennia for sea levels to rise those 6 to 9 meters when temperatures were warmer than today.”