Global climate change is causing Antarctic ice shelves to shrink and split apart, yielding thousands of free-drifting icebergs in the nearby Weddell Sea. According to a new study in this week’s journal Science these floating islands of ice – some as large as a dozen miles across – are having a major impact on the ecology of the ocean around them, serving as “hotspots” for ocean life, with thriving communities of seabirds above and a web of phytoplankton, krill, and fish below.

New York City’s smoking rate has plummeted since a comprehensive program against smoking was launched in 2002, according to findings issued today in the national Centers for Disease Control and Prevention’s Morbidity and Mortality Weekly Report (MMWR). The 2006 rate was nearly 20% lower than the 2002 rate -- a decline that represents 240,000 fewer smokers. The City’s rate for 2006 is the lowest on record (17.5%), and lower than all but five U.S. states (California, Washington, Idaho, Utah and Connecticut). Over the past year, smoking decreased among men (from 22.5% to 19.9%) and among Hispanics (from 20.2% to 17.1%). These large declines followed a year-long ad campaign aimed at prompting more smokers to quit. The new report is available online at www.cdc.gov/mmwr/.

The President has again vetoed the Stem Cell Research Enhancement Act, which would expand federal support for embryonic stem cell research. AAAS, the world’s largest general scientific society, stands with a broad coalition of Americans spanning all parties and faiths that supports this bill.

The extinction of many large mammals at the end of the Ice Age may have packed an even bigger punch than scientists have realized. To the list of victims such as woolly mammoths and saber-toothed cats, a Smithsonian-led team of scientists has added one more: a highly carnivorous form of wolf that lived in Alaska, north of the ice sheets.