Students from Elementary, Middle and High School participate in a 24 hours Zero Waste Challenge at school. All the trash cans are removed for an entire day of activities, and students and teachers should carry their trash can in a cloth bag on their back. Exercise should continue during all day activities outside school. The next morning all trash is collected and weighed. This challenges everyone to live a zero waste day, separate their trash to recyle it, to generate less trash, to reuse stuff, etc. We choose this date to celebrate International Mother Earth Day.