Robock said he became suspicious about the intelligence agencies’ involvement in climate change science after receiving a call from two men who claimed to be CIA consultants three years ago. “They said: ‘We are working for the CIA and we’d like to know if some other country was controlling our climate, would we be able to detect it?’ I think they were also thinking in the back of their minds: ‘If we wanted to control somebody else’s climate could they detect it?’”