Pope Francis made the religious case for tackling climate change on Wednesday, calling on his fellow Christians to become “Custodians of Creation” and issuing a dire warning about the potentially catastrophic effects of global climate change.

Speaking to a massive crowd in Rome, the first Argentinian pope delivered a short address in which he argued that respect for the “beauty of nature and the grandeur of the cosmos” is a Christian value, noting that failure to care for the planet risks apocalyptic consequences.

“Safeguard Creation,” he said. “Because if we destroy Creation, Creation will destroy us! Never forget this!”

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