"Collapse organized human society" is a doomsday mentality. There are too many variables to conclusively decide what climate change will do in 5, 10, 50 years. Especially as nations move toward sustainable energy alternatives and humans collectively ease their carbon emissions through diversified consumer options, who knows what technology and human initiative to save ourselves will bring about. I'd rather live hopefully in a world that will end tomorrow than pessimistically in one that will last infinitely.