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It’s sprayed on home gardens, Little League Baseball fields and, most heavily, the corn, soybean and other crops of the Central Valley.

More than 10 million pounds of glyphosate, the active ingredient in the weedkiller Roundup, are applied in California each year, according to government figures.

Now, after a yearlong legal battle, California’s environmental health agency has announced that it will list it as a known carcinogen.

The move would make the agency the first American regulatory body to do so. Yet the science is not settled, researchers say.