I saw this signs outside a restaurant in Nan city, North Thailand. I like this, because most Thai are very easy with using all kind of plastic and foam at markets and restaurants. But this all comes in our environment and most of it can be done in another way. So please try to say NO when people give you a plastic bag, foam box, a plastic spoon or a straw to drink. The 7/11 and super-markets in Thailand could play a major role in this (and save money).