Some of America's leading billionaires have met secretly to consider how their wealth could be used to slow the growth of the world's population. Described as the Good Club by one insider, it included David Rockefeller Jr, the patriarch of America's wealthiest dynasty, Warren Buffett and George Soros, the financiers, Michael Bloomberg, the mayor of New York, and the media moguls Ted Turner and Oprah Winfrey. They gathered at the home of Sir Paul Nurse, a British Nobel prize biochemist and president of the private Rockefeller University, in Manhattan on May 5. The informal afternoon session was so discreet that some of the billionaires' aides were told they were at security briefings". Stacy Palmer, editor of the Chronicle of Philanthropy, said the summit was unprecedented. "We only learnt about it afterwards, by accident. Normally these people are happy to talk good causes, but this is different - maybe because they don't want to be seen as a global cabal," he said. Some details were emerging this weekend, however. Taking their cue from Gates they agreed that overpopulation was a priority. [A] guest said there was "nothing as crude as a vote" but a consensus emerged that they would back a strategy in which population growth would be tackled as a potentially disastrous environmental, social and industrial threat. "This is something so nightmarish that everyone in this group agreed it needs big-brain answers," said the guest. "They need to be independent of government agencies, which are unable to head off the disaster we all see looming." Why all the secrecy? "They wanted to speak rich to rich without worrying anything they said would end up in the newspapers, painting them as an alternative world government," he said.