Worldwide CO2 emissions rose at a faster rate in 2000-2004 than the worst-case scenario imagined in this year’s UN reports on climate, according to new research.

The rise over the first four years of this century is also greater than in the 1990s - 3.1% a year between 2000-2004, up from an average of 1.1% a year during the 1990s.

This is faster than scenarios developed by the Intergovernmental Panel on Climate Change (IPCC), suggesting even its most alarming predictions of the effects of climate change may not tell the whole story.

The earth’s ability to soak up the gases causing global warming is beginning to fail because of rising temperatures, in a long-feared sign of “positive feedback,” new research reveals today.

Climate change itself is weakening one of the principal “sinks” absorbing carbon dioxide - the Southern Ocean around Antarctica - a new study has found.

As a result, atmospheric CO2 levels may rise faster and bring about rising temperatures more quickly than previously anticipated. Stabilising the CO2 level, which must be done to bring the warming under control, is likely to become much more difficult, even if the world community agrees to do it.

In a collision of 21st-century science and decades-old conspiracy theories, a research team that includes a former top FBI scientist is challenging the bullet analysis used by the government to conclude that Lee Harvey Oswald alone shot the two bullets that struck and killed President John F. Kennedy in 1963.

The “evidence used to rule out a second assassin is fundamentally flawed,” concludes a new article in the Annals of Applied Statistics written by former FBI lab metallurgist William A. Tobin and Texas A&M University researchers Cliff Spiegelman and William D. James.

An area as large as the US state of California melted due to warmer temperatures in western Antarctica a satellite from the US space agency showed, according to a NASA analysis of the largest melt in recent decades. The data collected by the NASA satellite, QuickScat, between July 1999 and July 2005 captured the largest melting in 30 years during January 2005, scientists said late Tuesday.

The US military has begun to plan for a possible avian flu pandemic that could kill as many as three million people in the United States in as little as six weeks, a Pentagon planning document said.

The Defense Department’s “Implementation Plan for Pandemic Influenza,” which was posted Wednesday on a Pentagon website, lays out guidelines and planning assumptions for US military services and combatant commands.