What does “Probably Cause Cancer” actually mean?

Grist asked: “Hey Risk Bites guy, the WHO just said that the herbicide in Roundup probably causes cancer — what’s the deal with that? It seems like every month we find out that something else is probably giving us cancer. Should we be worried?”
http://grist.org/science/watch-stick-…

Backing track: Blue and Green by Rimsky. http://www.premiumbeat.com/royalty_fr…

FURTHER INFORMATION:

Grist: http://grist.org

So Roundup “probably” causes cancer. This means what, exactly? http://grist.org/business-technology/…

New York Times: Weed Killer, Long Cleared, Is Doubted. http://www.nytimes.com/2015/03/28/bus…

International Agency for Research on Cancer (IARC) monologue on organophosphate insecticides and herbicides: http://www.iarc.fr/en/media-centre/ia…

Agents classified by IARC: http://monographs.iarc.fr/ENG/Classif…

More information on IARC monographs: http://monographs.iarc.fr/ENG/Preambl…

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http://amara.org/v/GUz2/