Universal ratification of the Optional Protocol on the Involvement of Children in Armed Conflict will establish an international moral consensus that no child should take part in hostilities or be involuntarily recruited and that former child soldiers should be assisted by their governments after a life of violence and distress.

Climate change does not respect border; it does not respect who you are - rich and poor, small and big. Therefore, this is what we call global challenges, which require global solidarity.

Nuclear terrorism is one of the most serious threats of our time. Even one such attack could inflict mass casualties and create immense suffering and unwanted change in the world forever. This prospect should compel all of us to act to prevent such a catastrophe.

To measure the success of our societies, we should examine how well those with different abilities, including persons with autism, are integrated as full and valued members.

A deal must include an equitable global governance structure. All countries must have a voice in how resources are deployed and managed.

Climate change has happened because of human behaviour, therefore it’s only natural it should be us, human beings, to address this issue. It may not be too late if we take decisive actions today.

You are here to step into the shoes of UN ambassadors - to draft resolutions, to plot strategy, to negotiate with your allies as well as your adversaries. Your goal may be to resolve a conflict, to cope with a natural disaster or to bring nations together on an issue like climate change. You may be playing a role, but you are also preparing for life. You are acting as global citizens.