Why does Starbucks use paper cups and glasses?

Starbucks has two kinds of cups, take-away cups and mugs.

Takeaway cups are cups that customers can take away for free. Hot drinks are made of paper, and cold drinks are made of plastic and transparent. With Starbucks LOGO on it, the theme is green, white and transparent.

Mugs include white porcelain cups and transparent cold drinks cups, which are used for cold drinks. This kind of cup is like a plate in a shop. You can't take it away after drinking it. And this kind of cup has no lid. Among them, white porcelain cups can also hold cold drinks, while transparent cold drinks cannot hold hot drinks.

There is also a drinking cup, which is the same size as the disposable paper cup at home. It is pure white, without any logo. It is a cup that provides customers with white water for free.