Impossible!
Even if Erlich has survived, there is no one to hear him speak at the “Vatican Conference”!
Everyone died of starvation decades ago.
” In The Population Bomb, Ehrlich predicted that hundreds of millions of people would die of starvation during the 1970s because the earth’s inhabitants would multiply at a faster rate than world’s ability to supply food. Six years later, in The End of Affluence, a book he co-authored with his wife Anne, Ehrlich increased his death toll estimate suggesting that a billion or more could die from starvation by the mid-1980s.”
http://www.nationalcenter.org/dos7111.htm
Remember Ehrlich’s academic expertise is butterfly population dynamics. However his biggest contribution to society is that of being a living example of “expertise in one field in no way implies expertise in other fields and be too arrogant to know that!”.
Paul Ehrlich, Wrong Since 1968.