A protester blocked a main road through Manchester city centre this afternoon.
Pictures show the campaigner sat in the middle of the road on Fountain Street, near Primark at the junction with Market Street.
He was holding a sign that read 'I'm terrified that climate breakdown will kill millions' and '30 years of climate inaction and only a few years left to act'.
Photos show police talking to him before he was moved off the road.
Officers then appeared to arrest him.
The protest caused 'heavy congestion' in the area, transport bosses said.
Vehicles were unable to travel along Foundation Street which leads to High Street.
In a tweet, Transport for Greater Manchester said: "Due to protesters blocking the road, there is heavy congestion on Fountain Street leading to High Street, City Centre.
"To avoid delays, please find an alternative route through the city."
The M.E.N has contacted Greater Manchester Police for a comment.
