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2 answers

1. Expiration (Breathing Out)

2. Burning Fossil Fuels at Factories

3. Driving your Car

4. Using a Lawn Mower

5. Having a Camp Fire

2007-11-06 13:39:35 · answer #1 · answered by Hubris 2 · 0 0

Farting

Breathing

burning propane

2007-11-06 13:36:21 · answer #2 · answered by ziggy_brat 6 · 0 0

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