A grandfather sat in the road as he held a one-man climate change protest in Barry.
Hugh Thomas stopped traffic on the town's High Street for 15 minutes on Wednesday.
He wore a sign that read: "I'm terrified for my grandson's future because of the climate crisis."
Mr Thomas says he sat in the way of oncoming traffic to speak out about government inaction on climate.
He was alone in Barry but across the UK there were many just like him who also took action in their home towns by sitting down in front of traffic at 11am.
The landscape gardener, 65, said: "Now really is our last chance to avoid runaway climate disaster. We have to act now to save ourselves, and our wonderful wildlife and natural world, from extinction.
"We have a personal responsibility and so does our government. Back in May 2019 the UK Parliament declared an environment and climate emergency.
"And yet this February chief executive of the Environment Agency Sir James Bevan said that the UK is hitting worst-case environmental scenarios that if left unchecked would collapse ecosystems, slash crop yields, take out the infrastructure that our civilisation depends on, and destroy the basis of the modern economy and modern society.
"Our leaders are still not taking this seriously. It’s time for ordinary people to step up and demand action."
He added: "The next two years are our last chance to remake the world and Cop 26 missed it. Their failure is a crime against humanity.
"The people taking action today hope to make clear that they can no longer trust the Welsh and UK Government with their future.
On Saturday thousands of people took part in a global day of action by holding a protest march from Cardiff's City Hall to the Senedd.
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