Each group (regardless of the size of the group) needs:

• 175 round toothpicks (need ~150, but require extras in case of breakage; round toothpicks are stronger than the flat type)
• 300 gumdrops
• 1 roll of masking tape (to mark an area to "contain" the molecules)
• Graph paper, 1 piece per student
• Graph of Global CFC Production, 1952-2000, 1 per group
• Battling for Oxygen Worksheet, 1 per student

The following items are optional, depending on the type of activity data analysis conducted:

• 1 roll of large butcher paper, at least 2 ft. wide x 25 ft. long
• Marking pens
• Tape (to hang butcher paper drawings)