Elon Musk: Paul Ehrlich is a genocidal maniac

"Paul Ehrlich is a genocidal maniac as far as I'm concerned and I think he's a horrible human being. I hate Paul Ehrlich, I just want to be clear about that. I think he's terrible and his books have done great damage to humanity...the trend in birth rates for really all countries past certain level of economic development was trending to well bellow replacement if not already below replacement...if these trends continue, most countries will dwindle into insignificance, they might completely die out."