"This may in turn cause massive disruptions to human societies." The word "may" is doing a lot of work here. Lots of things may cause massive disruptions to hu

"This may in turn cause massive disruptions to human societies." The word "may" is doing a lot of work here. Lots of things may cause massive disruptions to human society. One thing we can say with certainty: the mitigation efforts being proposed to reduce CO2 levels will cause massive disruptions to human society.