Murty characterizes himself as a global warming skeptic. In an August 17, 2006 interview, he stated that "I started with a firm belief about global warming, until I started working on it myself...I switched to the other side in the early 1990s when Fisheries and Oceans Canada asked me to prepare a position paper and I started to look into the problem seriously.". Murty has also stated that global warming is "the biggest scientific hoax being perpetrated on humanity. There is no global warming due to human anthropogenic activities." Murty was among the sixty scientists from climate research and related disciplines who authored a 2006 open letter to Canadian Prime Minister Stephen Harper criticizing the Kyoto Protocol and the scientific basis of anthropogenic global warming.