The Club of Rome (http://www.clubofrome.org). 

deals with issues concerning the future of humanity. 

The first study, published, just referred to Limits to Growth: 

THE LIMITS TO GROWTH, Dennis L. Meadows et al.,
Universe Books, New York, 1972. 

Recently he has released a new study on the same subject: 

LIMITS TO GROWTH: THE 30-YEAR UPDATE, Dennis Meadows et al.,
Chelsea Green, 2004.