US President Joe Biden Wednesday said climate change was an ‘existential threat’ to humanity as he met with a small group of supporters in San Francisco, Report informs via Daily Mail.

Biden made his comments during the second day of a three-day fundraising swing through California.

On Wednesday evening he spoke with a high powered group of campaigners called the Climate Leaders Group in the drawing room of a Pacific Heights.

Biden has repeatedly warned that climate change and extreme weather are now the biggest threat to humanity.