Environment-protecting Guardians

We usually use many plastic bags in our daily life.However ,how much do you know about plastic bags?Do you know its history?Do you think they are good to our earth ?What's your opinion about the usage and modern situation?And do you have any suggestions ?To take better care of the world , we do this project .We do many researches and pay many efforts.We get a conclusion-we should reduce to use plastic bags.So we can live a better life!