In grand scheme of things, these don't matter when the sea level raises 2 meters and 2/3 of coastal population and civilization got wiped out post-2040.
That's your opinion. There are people who believe we need to curb the carbon based energy consumption and try to reverse the negative impact of greenhouse gas. Others don't.
> Please explain to me how this means the end of civilization.
Try google? There are loads of resources if you do and pay attention to the topic on HN. We're just scratching the surface of unknowns in how much worse it could get on the path of an accelerated climate change. For example: https://www.washingtonpost.com/news/wonk/wp/2014/02/11/there...
Oh, I said "coastal civilization" and hoping it doesn't get to "entire civilization".