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Humans have been tinkering with greenhouse gas levels in Earth's atmosphere for at least 2,000 years and probably longer, according to a surprising new study of methane trapped in Antarctic ice cores conducted by an international research team.

The Natural Hazards Center at the University of Colorado at Â鶹ӰԺ commissioned a series of six articles in 2004 titled "Disasters Waiting to Happen," one of which focused on a major hurricane striking New Orleans.

Edward E. David, Jr., science adviser to former President Richard Nixon from 1970 to 1973, will speak on the University of Colorado at Â鶹ӰԺ campus on Sept.12. Sponsored by CU-Â鶹ӰԺ's Center for Science and Technology Policy Research, the talk is part of a year-long series titled "Policy, Politics and Science in the White House: Conversations with Presidential Science Advisers."

Campus officials at the University of Colorado at Â鶹ӰԺ are reminding students, faculty and staff about the importance of computer security as part of a yearlong effort to raise awareness. The warnings come on the heels of a number of serious security breaches at the university over the summer.

Children displaced by Hurricane Katrina will soon receive a shipment of books donated by Coloradans through a book drive organized at the University of Colorado at Â鶹ӰԺ.

NEWS TIP SHEET Clare Huntington, associate law professor at the University of Colorado at Â鶹ӰԺ School of Law, recalls the late Chief Justice William H. Rehnquist as a man who "administered the court with terrific efficiency." Huntington clerked for U.S. Supreme Court justices Harry A. Blackmun and Stephen Breyer from 1998 to 1999. She said no clerk could spend time working with the court without getting to know Rehnquist.

The University of Colorado at Â鶹ӰԺ has established a "CU Campaign for Dillard University" to assist the New Orleans university in its rebuilding effort and has secured a $10,000 challenge grant from two anonymous donors in the first few days of the drive. The challenge grant will match the first $10,000 in donations received by the campaign, which would ensure a total of $20,000 in contributions once the goal is met. The campaign aims to exceed this goal. Anyone interested in assisting Dillard University is welcome to contribute.

The University of Colorado at Â鶹ӰԺ has welcomed 138 new students from universities damaged by Hurricane Katrina in the Gulf Coast region since last week. According to Kevin MacLennan, interim director of admissions for CU-Â鶹ӰԺ, 136 undergraduate students have been through the admissions process and are already attending classes or will be shortly. The School of Law also admitted two students.

Universities' struggles to attract and retain international graduate students and the potential fallout from this trend will be discussed in a Sept. 14 symposium at the University of Colorado at Â鶹ӰԺ. The CU-Â鶹ӰԺ Graduate School will present the symposium titled "Loss of International Graduate Students: Causes and Consequences" from 5:30 p.m. to 7 p.m. in Fiske Planetarium. The symposium is free and open to the public.

Author and lecturer Paul Loeb will present "Soul of a Citizen: Living With Conviction in a Cynical Time" at the University of Colorado at Â鶹ӰԺ on Sept. 13. The presentation will take place at 7:30 p.m. in MCD Biology Building room A2B70 and is free and open to the public. It is co-sponsored by the School of Journalism and Mass Communication and the Institute for Ethical and Civic Engagement.