Also from the 70's: 
It warned of the mass starvation of humans in the 1970s and 1980s due to overpopulation, The book started ”The battle to feed all of humanity is over … hundreds of millions of people are going to starve to death.” He spent much of the next decade writing other books and articles in support of his thesis in Population Bomb, adding in a later article “By 1985 enough millions will have died to reduce the earth’s population to some acceptable level, like 1.5 billion people.”