Go visit hellholes like Nigeria. Malthus' predictions are being fulfilled in places where birth rates have been way beyond replacement level. The people who are living most comfortably in today's world are the ones living in countries with very low birth rates. Even China, where the standard of living is still very low by Western standards, has made huge gains in standard of living over the time period that their population growth has been ruthlessly restrained -- the same time period during which fast-reproducing African and South/Central American countries went from bad to much much worse. The relationship between the U.S. economic and social dominance in the world, and its demographics, is not coincidental.
No, wait ... we starved to death in the 1970's because there were too many of those black, brown, and yellow people in the world, right, Dr. Erlich? Or did we freeze to death when we ran out of oil? My memory is so fuzzy these days, what with the global warming ...