On Monday, Archbishop of Canterbury Justin Welby apologized for arguing that world leaders who do nothing about climate change may be making a larger error than their forefathers who rejected Nazi warnings.

Welby, the spiritual leader of the worldwide Anglican Communion of around 85 million Christians, apologized for offending Jews with his remarks at the start of the climate change meeting in Scotland.

Welby apologized on Twitter, saying, “I unequivocally regret for the terms I used when trying to underline the gravity of the situation facing us at COP26.” “It’s never appropriate to draw parallels with the Nazis’ atrocities.”

On Monday, the United Nations summit vital to preventing the worst effects of climate change began, with world leaders, environmental scientists, and campaigners urging for immediate action to halt global warming.

Welby previously warned the BBC that world leaders will be “cursed” if they fail to negotiate a climate change agreement.

“People will speak of them in considerably stronger terms than we speak of the politicians who overlooked what was going on in Nazi Germany because this would harm people for years,” he warned.

“It will allow a genocide on an infinitely greater scale. I’m not sure there’s grades of genocide, but there’s width of genocide, and this will be genocide indirectly, by negligence, recklessness.”