In 1950, there were 2.5 billion people on the planet. Today, the number of humans wandering the earth is fast approaching 7.5 billion. More mouths to feed means more pressure on food resources, but how much do you know about the food on your plate? Take our quiz >>


원문출처 : http://www.cnn.com/2016/06/30/world/going-green-quiz/index.html