May 26, Wednesday -- UC Davis paleoclimatologist Howard Spero delivers insights on the threat of global climate change on the eve of the premiere of a new mass-market film on the subject, "The Day After Tomorrow." Spero is an expert on reconstructing Earth's climate using chemical analyses of fossil seashells. His study recently published in Nature reinforces concerns that global warming, by melting the glacial ice of Greenland, could quickly and profoundly change climate-affecting factors in the north Atlantic Ocean. Spero's presentation, titled "2 Days Before the Day After Tomorrow," is at 4:10 p.m. in 55 Roessler Hall on campus.