Global warming will take a holiday at the box office this holiday weekend as a new Ice Age dawns with an expected five-day take of about $60-70 million, according to industry forecasters. Last year, Will Smith's Hancock rook first place with $62.6 million. In a surprise, Ice Age Dawn of the Dinosaurs leaped ahead of Transformers Revenge of the Fallen out of the holiday starting gate on Wednesday with an official take of $13,791,157 -- the seventh-best opening for an Independence Day holiday. To be sure, Transformers was nowhere close to folding as it pulled in $10,939,131. Also making an impressive showing was Michael Mann's Public Enemies, which bowed at $8,165,025 but could see its numbers rise substantially over the weekend -- particularly tonight -- as older audiences arrive at the multiplex. The film, which stars Johnny Depp and Christian Bale, has piled up dozens of positive reviews, including several which predict Oscar nominations for the director and his stars. On Thursday, the Fandango online ticket sellers said that Ice Age accounts for 46 percent of its advanced ticket sales, while Public Enemies accounts for 21 percent, and Transformers 2, 9 percent. Also opening today (Friday) is the Nia Vardalos comedy I Hate Valentine's Day . It's expected to be a big, fat bomb.