A 'Green Santa' will be in Dublin this weekend to listen to what children want for the planet this Christmas.

The pop-up grotto, complete with a green-suited Santa and "eco-elves", is the idea of Dr Laura Kehoe, a sustainability researcher at the University of Oxford.

"We want people to write a letter to Santa about what they want to see happen to make the world a healthier and happier place. Kids and adults are dealing with a lot of stress as they come to terms with the climate crisis.

"We don't know what the world will look like a few decades from now, but writing about what we want to change in the world is empowering. By describing our dreams for the planet, we mentally create a pathway towards a more hopeful future," Dr Kehoe said.

The letters to Green Santa will be delivered to the United Nations Climate Change Conference in Madrid next week by Irish student climate striker Saoi O’Connor.

"I hope our messages will reach world leaders and they will realise two crucial things: the terrifying reality that we are running out of time to safeguard our own future and the unique opportunity they have right now to change the course of history by taking strong action," Dr Kehoe said.

Green Santa will be on Grafton Street from 12pm on Sunday.

People can also share their Green Santa letter on social media, using the hashtag #GreenSanta.