NEW YORK (Reuters) - Starbucks Corp said on Monday it will begin phasing out use of plastic straws at its restaurants by 2020, giving environmentalists a sizeable victory in their campaign to convince restaurants to abandon plastic utensils. The Seattle-based chain said it would eliminate single-use plastic straws globally at its 28,000 locations. The straws will be replaced by new recyclable strawless lids and alternative material straws.