@Ajay distilled it down perfectly. It is about climate change, and how after all this time from scientists and data specifically spelling out the problem, we are now probably too late to really turn the tide of climate change. This is also confirmed by the movie's creators.
Also, agree with @phil bottle regarding the comedy aspect. I have zero desire to watch the movie because it's not my preferred comedy style. Plus, while I enjoy thought provoking movies, I need to be in the mood for them... especially if it is not a comedy style I enjoy.