Ganggang atau alga sering dianggap buruk karena bisa menyebabkan zona mati di lautan atau limbah beracun di kolam. Tapi ilmuwan di AS mendapati ganggang bisa diolah menjadi bahan bakar dan juga bahan baku makanan serta berbagai produk. Berikut laporan Helmi Johannes dari VOA di Washington, DC.
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