Coca-Cola, the world’s biggest drinks brand, has announced it will increase the amount of recycled plastic in its bottles to 50 percent, up 10 percent from its previous goal. The company described the proposal as ambitious, but environmentalists said they did not go far enough, pointing towards other companies that are already at 50 percent and aiming to be at 100 percent by 2020. Coca-Cola said it would hit its 50 percent target by investing millions of pounds in Europe’s largest and most advanced plastic bottle recycling facility based in Licolnshire, England.