This is an actual billboard on the Trans-Canada on the way to Banff:
Quote:
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The billboard promotes a conspiracy theory about governments secretly spraying chemicals from the sky to sterilize people. While it sounds outlandish, Keith has received aggressive threats from some who believe the theory because his research revolves around finding ways to alter the atmosphere to limit the effects of climate change.
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http://www.cbc.ca/news/canada/calgar...anff-1.3733776