HAVANA — Fidel Castro participated in a scientific conference with a US researcher on Tuesday, discussing the threat of a "nuclear winter."

Alan Robock, a professor in the Department of Environmental Studies at Rutgers University, spoke with the retired Cuban dictator during a meeting in Havana.

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The pair talked about the catastrophic effects on global climate change that could be unleashed by nuclear war, state media said.

Castro has spent months warning of a nuclear war pitting the US and Israel against Iran and could also involve an attack on North Korea.

He said fighting should have begun in July but has since said he may have been premature.

Castro and Robock said that in addition to countless deaths, such a conflict would be devastating for the planet's environment.