Clip of Trump ignoring Thunberg goes viral

A clip of US President Donald Trump walking past teen climate activist Greta Thunberg in the corridors of the United Nations in New York has gone viral.

The brief video, which made waves online, appeared to show Trump ignoring the 16-year-old Swede who was behind him, as the UN was holding a key summit on climate change on Monday.

The clip was quickly picked up by Sky News, Euronews and online outlet Now This, and was also shared on Twitter by foreign policy guru Ian Bremmer.

The clip was also made into a GIF to make it more easily shareable.

The video appeared to have been originally filmed by the Reuters news agency, which was following the president as he made a three-day visit to New York for the UN General Assembly.

Thunberg earlier gave an impassioned speech at the climate event, telling world leaders they were failing young people by not acting to stop the climate crisis.

Trump, who was not scheduled to appear, dropped in for a few minutes before leaving to host a side event on religious freedom. The president has often voiced his scepticism about climate science and has even claimed it was a Chinese hoax.