1. Earth Day - Noun
2. Earth Day - Proper noun
(North American countries) April 22; Created in 1970, global day of observance of the need to protect the earth.
(obsolete, US) March 21st.
Earth day (plural Earth days)
(science fiction) A day in Earth time; the period it takes planet Earth to revolve once; a period of 24 hours.
Earth Day 1970 was irrefutable evidence that the American people understood the environmental threat and wanted action to resolve it. Barry Commoner
On our present course, this may eventually stand as the ultimate achievement of Homo sapiens sapiens. We should take a bow. We are obviously planet killers. The question is, can we also be planet saviors? I'd say that seems unlikely. Happy Earth Day. Caitlín R. Kiernan
With environmental progress continuing, environmental consciousness high among the American people and the environmental movement increasingly viewed as an obstacle to further environmental progress, both Earth Day and the environmental movement may have run their course. David A. Ridenour
If we are ever to halt climate change and conserve land, water and other resources, not to mention reduce animal suffering, we must celebrate Earth Day every day - at every meal. Ingrid Newkirk
Well, perhaps the greatest achievement, and we didn't know it at the time, was we held an Earth Day in 1970, and out of that Earth Day a lot of students got involved in saving the environment, or trying to. Pete McCloskey
Earth Day should encourage us to reflect on what we are doing to make our planet a more sustainable and livable place. Scott Peters