Perhaps you could explain your mission to them, and they in turn could present it to their various peoples.
6 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.
You can hear this line at 00:25:54 in the radio play.
Quote context
[...]
- What exactly is the nature of your mission?
- To warn you that your planet faces danger.
- What I have to say must be said to all concerned. I come to you as a last resort.
- Must I take drastic action in order to get a hearing?
- What sort of action do you mean?
- Perhaps leveling the island of Manhattan... or toppling the Rock of Gibraltar into the sea? Well?
- That is what I came to see you about.
- One thing, Klaatu. Suppose this group should reject your proposals.
- There is no alternative, Professor. In such a case, the planet Earth would have to be eliminated.
- I assure you, such power exists.
- The scientists who are attending these meetings have come here from all over the world.
[...]