Together they will influence markets all over the world on a scale we’ve never seen before.

The U.S. Justice Department this month is expected to approve a merger of two huge corporations ― St. Louis-based seed company Monsanto and German crop-chemical conglomerate Bayer ― and the consequences could be enormous.

The $66 billion deal, already approved by the European Union, will create the world’s biggest pesticides and seeds monopoly. The hookup will confine 61 percent of global seeds and pesticides production in the hands of just three megacorporations ― the other two being newly merged DowDuPont, and ChemChina, which acquired pesticides and seed company Syngenta last year.

Is that a problem?

It depends who you ask. Monsanto and Bayer are pitching their consolidation as a way to develop the technology and innovation necessary to feed a world that in two decades is likely to be home to 10 billion people. For critics ― environmentalists and many farmers ― it’s a terrifying step toward a near-monopoly in agriculture, giving giant companies unprecedented access to farmer data, squeezing out small farmers, and potentially raising food prices for consumers.