Scientists from San Diego and a dozen countries around the world are gathered at the University of San Diego this week to share their latest research. Among some of the major topics at the American Association for the Advancement of Science conference are climate change, heat waves and ocean acidification. Geophysicist Peter Ward, who worked for the U.S. Geological Survey for nearly three decades, discussed warming global temperatures during his Wednesday session. "There's a very interesting correlation between warming and volcanism at the end of the last ice age," Ward said. He said the past two years of record warmth...