A protester with a plastic wrap on her head stands next to a barricade during clashes in Istanbul early Tuesday, June 4, 2013. Police in Turkey have used tear gas for a fourth day to disperse demonstrations that grew out of a sit-in to prevent the uprooting of trees at Istanbul’s main square. Demonstrators are also venting pent-up resentment against Prime Minister Recep Tayyip Erdogan, who has been in office for 10 years. (AP Photo/Thanassis Stavrakis)