"Researchers from Brown University have reconstructed 5-million years of climate using tiny marine fossils found in mud off the coast of South America. The climate record unearthed by the Brown team is the longest continuous record of ocean temperatures on Earth. "
...
"Lawrence and the team of geologists from Brown found that surface temperatures in the eastern equatorial Pacific were 27° Celsius 5 million years ago and have steadily declined by roughly one degree Celsius every million years since. Currently surface temperatures stand at 23 Celsius, but research elsewhere indicates that global sea temperatures are increasing. The Brown study suggests that higher ocean temperatures could have a significant impact in the future. "
http://news.mongabay.com/2006/0410-brown.html

More confirmation that in terms of millions of years [a blink in Earth's long history]. We are in a cold period, NOT a warm period. And as I've heard elsewhere, one main reason may have to due with having the Antarctic continent where it is [remember continents move when in timescale of millions of years]