'Existential' Risk of Climate Crisis Could Lead to Civilizational Collapse

Even by the standards of the dire predictions given in climate studies, this one's extreme: civilization itself could be past the point of no return by 2050.  That's the conclusion from Australian climate think tank Breakthrough National Centre for Climate Restoration, which released a report (pdf) May 30 claiming that unless humanity takes drastic and immediate action to stop the climate crisis, a combination of food production instability, water shortages, and extreme weather could result in a complete societal breakdown worldwide.