All are interrelated."It is this generalized meta-problem (or meta-system of problems) which we have called and shall continue to call the 'problematic' that inheres in our situation."[6]: 12–13

In October 1968, the OECD held a symposium in Bellagio, Italy, in collaboration with the Rockefeller Foundation, at which several new members joined the Club.The symposium focused on the dangers of exponential growth—which by its nature cannot continue forever—and ended with participants signing "The Bellagio Declaration on Planning", which emphasized the need to overcome global problems through coordination.[4]

For a brief period, the Club's ideas held sway within the OECD, thanks to King's efforts in promoting the group's work.When Secretary General Thorkil Kristensen formed a group of ten science and economic experts in 1969 to study problems for modern societies, four of the ten were members of the Club of Rome.[4]

In 1970, Peccei's vision was laid out in a document written by Hasan Özbekhan, Erich Jantsch, and Alexander Christakis.