EARTH DAY- 22 April

 'Treat the Earth well. It was not given to you by your parents, it was loaned to you by your children'.
Kenyan proverb

Founded in 1970 as a day of education about environmental issues, Earth Day is now a globally celebrated holiday that is sometimes extended into Earth Week, a full seven days of events focused on green awareness. The brainchild of Senator Gaylord Nelson and inspired by the antiwar protests of the late 1960s, Earth Day was originally aimed at creating a mass environmental movement. It began as a “national teach-in on the environment” and was held on April 22 to maximize the number of students that could be reached on university campuses. By raising public awareness of air and water pollution, Nelson hoped to bring environmental causes into the national spotlight. Read more : 
 http://www.history.com/topics/holidays/earth-day

Z okazji Dnia Ziemi kilka wyrażeń ze słowem 'Earth' ;)

Angielski online / e-Metropolitan English

What on earth? - Used to emphasize shock, anger, etc. / Co do licha?
Why on earth? - 'Why' with emphasis

down to earth – practical / twardo stąpający po ziemi
Where on earth? - No gdzie? - z naciskiem
cost the earth – to cost a fortune / kosztować fortunę
Earth to someone (Earth to John) – Hello, are you listening?
Back to earth – to return to a more usual condition / wrócić na ziemię