Most Christians have no problem with Earth Day.
The English word "Easter" relates to the name of the month in which the Holy Day was celebrated in ancient England, a month which may have been named after a Pagan goddess of spring.
The great feast of the Resurrection of Jesus Christ was celebrated long before the unchristian English word "Easter" was first used. And the celebration of the Resurrection of Jesus Christ is directly related to the Jewish feast of Passover going back to about 3,000 B.C.E.
Most other languages use the Jewish/Christian word for "Passover" for the great celebration of the Resurrection of Jesus Christ that English speakers call "Easter."
The Greek term for "Passover" is Páskha. It is the Aramaic form of the Hebrew pesach (meaning passover). Other languages:
Afrikaans: Paasfees
Albanian: Pashkët
Breton: Pask Seder
Catalan: Pasqua
Chamorro: Pasgua
Cornish: Pask
Danish: Påske or Paaske
Dutch: Pasen or Paschen
Esperanto: Paskon
Finnish: Pääsiäistä
French: Pâques
Galician: Pascuas
Icelandic: Páska
Indonesian: Paskah
Italian: Pasqua
Jèrriais: Pâques
Latin: Pascha
Norwegian: Påske
Portuguese: Páscoa
Russian: Pascha
Scottish: Pask
Sicilian: Pasqua
Spanish: Pascuas
Swahili: Pasaka
Swedish: Påsk
Welsh: Pasg
Even in the German provinces of the Lower Rhine where the Teutonic goddess Estre had its origins, the people call the feast Paisken not Ostern.
The popular observance of Easter has incorporated a couple of pagan symbols of fertility in rabbits and eggs but they have nothing to do with the actual celebration of the Resurrection of Jesus Christ. If some Christians want to do away with Easter bunnies and Easter eggs then I have no problem with that but do not throw Jesus Christ out with them.
With love in Christ.