If you want to see a perfect developed city which strongly controls rubbish/trash is Singapore! They impose the most ridiculous litter laws of which you can imagine. If Qatar imposes these laws, you will definitely see less trash for sure. Just like Qatar, Singapore is made with diverse cultures. This mainly includes the Indian descendants, Chinese descendants, and as well as European descendants. Yet, people coincide and respect one another. I believe if Singapore can do it, so can Qatar. GO QATAR!