January
- 1st: New Year’s Day– Resolve to go GREEN!
February
- 2nd: World Wetlands Day
- 11th: International Day of Women & Girls in Science
March
- 3rd: World Wildlife Day
- 2nd Friday: Solar Appreciation Day
- 20th/21st: Spring (Vernal) Equinox
- 21st: International Day of Forests
- 22nd: World Water Day
- 23rd : World Meteorological Day
- Last Saturday: Earth Hour
April
- 3rd World Aquatic Animal Day
- Week before Earth Day: National Environmental Education Week
- Indigenous Tree Day
- 22nd: Earth Day
- 26th: National Healthy Schools Day
- Last Friday: Arbor Day
May
- First full week – International Compost Awareness Week
- 9th (2nd Saturday): International Migratory Bird Day
- 16th Endangered Species Day
- 3rd Friday: Bike-to-Work Day
- 22nd: International Day for Biological Diversity
- 23rd: World Turtle Day
June
- 1st Saturday: National Trails Day
- 5th: World Environment Day
- 8th: World Ocean Day
- 15th: Global Wind Day
- 21st/22nd: Summer Solstice
July
- 11th: World Population Day
- 26th: International Day for the Conservation of the Mangrove Ecosystem
August
- 12th: International Youth Day
September
- 4th: National Wildlife Day
- 21st: International Day of Peace
- 21st: Zero Emissions Day
- 22nd: World Car-free Day
- 22nd/23rd: Fall (Autumnal) Day
October
- 1st Week: Junk Mail Awareness Week
- 1st: World Vegetarian Day
- 4th: World Animal Day
- 8th: Hydrogen Fuel Cell Day
- 17th: International Day for the Eradication of Poverty
November
- 1st: World Vegan Day
- 5th: World Tsunami Awareness Day
- 15th: America Recycles Day
December
- 21st/22nd: Winter Solstice