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In this Sept. 27, 2018, photo provided by Green Grazing, Australis Aquaculture employee Khanh Huynh checks on seaweed cultures, near Ninh Hai, Vietnam,   Australis’s “Greener Grazing” project seeks to make a kind of seaweed that helps reduce methane emissions in livestock available to more farmers. (Josh Goldman/Green Grazing via AP)

In this Sept. 27, 2018, photo provided by Green Grazing, Australis Aquaculture employee Khanh Huynh checks on seaweed cultures, near Ninh Hai, Vietnam, Australis’s “Greener Grazing” project seeks to make a kind of seaweed that helps reduce methane emissions in livestock available to more farmers. (Josh Goldman/Green Grazing via AP)

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