There's a back story here that I'd love to know. How did you manage to be singled out among all the young climate activists in the world to be the one to gain access to the podium at the UN General Assembly? Surely it's not the uniqueness of your message, nor even your youth; there are many other youthful climate activists with the same message.
The biggest problem in addressing your message to "the people in power" who are sympathetic to it is that they are very likely to say to themselves, "Who, me? It's those other guys out there who are the problem.". Meanwhile,people like Robert Murray, the founnder and CEO of Murray Energy, the largest privately held coal company in the United States, thumb their noses at you and continue on their merry (destructive) way.