Daily Roundup: November 20, 2009

The Replacements: The St. Louis Zoo installed electronic polar bears as stand-ins for deceased bears. The zoo's last living polar bear suffered from cancer and was euthanized this spring. Inhabitots and Huffington Post

Literary Offsets: A San Francisco bookstore is donating 100 percent of the sales proceeds from Sarah Palin's book Going Rogue: An American Life to the Alaska Wildlife Federation. Ecorazzi

Portrait of the Artist: Jeanne-Claude, collaborator with husband Christo, died in New York City. The art duo produced large-scale environmental installations including The Gates in Central Park. Treehugger and Philadelphia Inquirer

Whodunit? Researchers studying ancient lake deposits have ruled out habitat loss due to climate change and asteroid impact as the cause for the extinction of woolly mammoths. The possibility that humans hunted the large animals into oblivion is still under consideration. Los Angeles Times and New York Times

Chatter: Thousands of emails and documents from the Climate Research Unit at the University of East Anglia were stolen by a hacker and posted online. The content of the emails has stirred controversy, and global warming skeptics claim that the correspondence shows collusion and data manipulation. Wired and Examiner

--Della Watson