Climate protesters have blocked a key city centre route in Cardiff, with commuters warned to expect disruption.
A number of members of Extinction Rebellion are outside Cardiff Castle and have a parked a green boat in the middle of the street.
One protester, who called himself Livvy, said the group wanted to raise awareness about climate change.
South Wales Police has warned motorists to expect disruption throughout the day.
Cardiff Bus said it was experiencing severe delays to services.
Police have closed the road to vehicles from the junction with Queen Street to Westgate Street.
Cardiff is one of "five centres of disruption" planned by the group, with others due to take place in Leeds, Glasgow, London and Bristol.
"We want to achieve some serious changes by the government, we are hoping to raise awareness, get people talking about it," said Livvy.
"If you weigh it up against the disruption down the line, this is nothing compared to what will happen if we do nothing.
"We are going to hold this site as long as we can. We fully intend for it to remain peaceful for the duration, we don't want any aggression or violence."
Extinction Rebellion Wales said the Cardiff protest was aimed at highlighting the need for the Welsh Government to "dramatically accelerate its actions in tackling the climate crisis and ecological emergency".
Staci Sylvan, 40, from the group, said: "In Carmarthen, where I live, we suffered a massive flood last October, we have never seen anything like it before.
"Out of a population of about 10,000, 100 were displaced or made homeless. Some of these people have been rehomed, but some still have no home.
"This has affected people on low incomes the most as there are no more houses available for them. Also there are some businesses who have not yet managed to reopen, maybe they never will.
"To me this is an issue about my children's future but also about equality, it is always the poorest people who suffer most from climate-related disasters.
"I want the government to do something about it now, not wait for more disasters and more people to suffer."
Protester Liz Shaw, 28, from Pembrokeshire, said: "I don't feel like I'm putting myself or others at risk. I got up at 4.30am today to be here.
"I got involved after the April rebellion because I felt people didn't realise the urgency of climate change. We have only got six years left."