West Wales climate campaigners met in Windsor at the end of August for a three-day protest.
The 'peaceful and colourful' event, called 'Upgrade Democracy,' aimed to demand urgent climate action and democratic reform.
The campaigners advocated for Citizens' Assemblies, a form of democracy with roots in Ancient Greece.
Jane Mansfield from Pentrecagal and Philip Hughes from Carmarthen posted letters to the King.
These letters, written by members of the public from Cardigan, expressed concerns about the climate and nature crisis, as well as hopes for effective action.
Many letters urged the adoption of Citizens' Assemblies, suggesting they could help restore faith in politics.
Ms Mansfield said: "So many have lost faith in our current system.
"People can see that money and power is concentrated in the hands of a few and that powerful business interests have corrupted our politics and media, causing denial and delay on the climate, whilst pushing other important decisions into the long grass.
"We urgently need another way of doing things that puts the well-being of young people and future generations front and centre.
"Citizens' Assemblies could be one of the changes that help us to break through the influence of vested interests in a manner that is fair to all."
The event was organised by Extinction Rebellion.
They thanked the people of Windsor for engaging with the protest positively.
The campaigners believe Citizens' Assemblies could work alongside and advise the current system, and urge everyone to get informed and ask elected representatives when they can expect to see them in action.
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