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Charles Manson broke a 20-year silence on the 40th anniversary of his conviction in the murders of eight people, including actress Sharon Tate, to speak out about the so-called perils of global warming, the U.K. Daily Mail reports.

The 76-year-old cult leader, who in 1969 led his followers to murder eight people, spoke about the "bad things" being done to the environment in an interview Monday with Vanity Fair Spain magazine.

"Everyone's God and if we don’t wake up to that there’s going to be no weather because our polar caps are melting because we’re doing bad things to the atmosphere," Manson reportedly said in a rambling jail cell interview from California’s Corcoran State Prison.

"If we don’t change that as rapidly as I’m speaking to you now, if we don’t put the green back on the planet and put the trees back that we’ve butchered, if we don’t go to war against the problem..." he reportedly said.

Manson also described himself in the interview as a "mean guy" and an "outlaw," according to the Daily Mail.

"I'm everything bad," he reportedly said.

Manson led the group known as the Manson Family, which in 1969 murdered eight people, including film director Roman Polanski's pregnant wife Sharon Tate. He is serving a life sentence for his role as the convicted ringleader in the gruesome murders.

Click for more on the Charles Manson interview from the U.K. Daily Mail