"My motivation was the message from Rachel Carson and her book Silent Spring, " recalls Jan-Gustav Strandenaes, one of the 10, 000 or so making up the Peoples' Forum.
"We have reached the point where weapons should be silent and ideas and politics should speak, " Ocalan's message said, echoing the words of an earlier call by Mr Erdogan.
Lorenz mentioned these four: Silent Sprint by Rachael Carlson , Collapse by Jared Diamond, 1984 by George Orwell, and Mutant Message Down Under by Marlo Morgan.