First Saturday of September - International Vulture Awareness Day

First week of September - Zero Waste Week

1 - International Primate Day

1 - Japan Dolphin Day

4 - National Wildlife Day

5 - Amazon Rainforest Day

7 - International Day of Clean Air for blue skies

16 - International Day for the Preservation of the Ozone Layer

September 16-22 - Science Literacy Week (Canada)

September 16-22 - European Mobility Week

17 - World Manta Day

17 - World Cleanup Day

17 - National Cleanup Day

18 - World Water Monitoring Day

21 - International Day of Peace

21 - Zero Emissions Day

Third Weekend in September - Clean Up the World Weekend

Third weekend in September - PARK(ing) Day

Third Saturday of September - International Red Panda Day

22 - Fall (Autumnal) Day

22 - International Tamarin Day

22 - Car Free Day

22 - World Rhino Day

23 - Ecological Debt Day (Earth Overshoot Day)

24 - World Gorilla Day

26 - World Cassowary Day

26 - World Environmental Health Day

26 - National Public Lands Day

27 - National Crush Day

Last Sunday in September - World Rivers Day