"[Prof.] Pianka then began laying out his concerns about how human overpopulation is ruining the Earth. He presented a doomsday scenario... War and famine would not do, he explained. Instead, disease offered the most efficient and fastest way to kill the billions that must soon die if the population crisis is to be solved.

[Later that day], the distinguished leaders of the Texas Academy of Science presented Pianka with a plaque in recognition of his being named 2006 Distinguished Texas Scientist."

-- Forrest Mims article (2006-04)

Here is a partial transcript of the speech by Prof. Pianka, along with several other sources that witnessed it.