I'll address this one point of yours:

"The sky is falling?"

Yes, it is falling (metaphorically speaking of course).   It's falling very slowly though and it may not crush us to death but we will have to adjust - as a species of course.

I'm not talking about in our lifetimes and I'm not just talking about climate change.   I'm talking about other damage to the planet.   Coral reefs are suffering and there is over-fishing and there is significant plastic and other toxic pollution in the ocean and I really like seafood.

And coral reefs support 25% of ocean life.

But even if you're a vegan or a strictly beef-eater things might not be so great in the future either.   Grazing land is being destroyed and there are droughts and diseases.   

I do have hope though.  Maybe we can hold up the sky somehow with advancements or maybe we can adapt.   I won't be alive to see it and our children won't either.  Time moves slowly on a geological scale, grasshopper