It depends on how you worded your essay and what your views on global warming are, the way I would word it is "in conclusion global warming is real and changing drastically every minute, and we don't fully know exactly how it will affect the world long-term" that's one way you can say it.
Mira must've felt eager to be able to go on a camping trip along with her parents, by the tone of the first sentence give brief reasoning on why she was feeling eager, it was because it was her first time.
