Many songs encourage us to attend parties: few mention the clean-up afterwards. Most of us would rather not think about the overflowing bins that usually follow good times.

But students at the Autonomous University of Barcelona have tackled the problem of trash after the bash.

Partygoers arriving at the university's annual celebration are offered colourful, plastic cups for 1 euro (just over a dollar). They can choose to take these 'party mugs' home to reuse at future events, or return them at the end of the night and get their money back.

As a result, waste has dropped by 0.3 kg per person -
that's 3 square metres of compacted plastic for the entire gathering.

Whatever your party style, there are plenty of ideas
for making it green. For more ideas see the youthXchange website.

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