What would you want the world to look like when you grow up?
Thirty primary school children from across Wales have written postcards about their hopes for the future, to world leaders who arrive in Newport for the Nato summit - a big meeting of some of the world's most powerful people.
The messages from nine- and ten-year-olds will be given to Prime Minister David Cameron and US President Barack Obama.
In the future, I would like it to be a peaceful world. I hope it will be a clean environment and will be safe to live in. I want it to be a friendly world. I hope there aren't many wars and we can live in peace. I want everyone's rights to be respected.
Audrey, Perth, Scotland
There are lots of things that I think need to be changed in the world but if there was one thing I could change it would be that children wouldn't start school until they are at least six. Some start school at four and I don't think that it's fair because they are still very young, vulnerable and unprepared for school.
Mezmia, London, England
In the future I would like people all over the world to look after the environment to make the world a better place.
Samuel, Perth, Scotland
What I would change in the world is for bullying to be banned because bullying upsets people.
Jessica, London, England
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