The rumor of scrap yard prices doubling on Earth Day is not true. Some scrap yards take advantage of the annual April 22nd pro-environment day with promotions. Some offer slighter higher scrap rates, but not nearly double rates.
One example is a yard that pays an extra 1/10th of a cent per pound. Some offer hot dog and t-shirt giveaways to increase traffic on Earth Day. Another scrap yard April 22nd exploit is encouraging people to donate their scrap value to charity.
The first Earth Day was April 22, 1970. It brilliantly focused the empowered-youth movement, mobilized by war protests, towards environmental issues. U.S. Senator from Wisconsin, Gaylord Nelson, was inspired to promote environmental consciousness and founded Earth Day in response to an oil spill in Santa Barbara, California in 1969. It is estimated that 20 million activists participated in rallies and events on the inaugural Earth Day.
Of interest, discover 11 Facts About Earth Day, shared by DoSomething.org.