This will be the first Earth Hour for countries including Kuwait, Qatar,Kosovo,Madagascar,Nepal, Cambodia and Panama.

VOA: special.2010.03.22

The first Earth Hour was held in two thousand seven in Sydney,Australia.

VOA: special.2010.03.22

Swan set out to change that. Invited to speak to world leaders at the first Earth Summit in Rio de Janeiro,Brazil, in 1992 he outlined a plan.

VOA: standard.2009.12.10

The first pictures of Earth taken from space showed a solid ball covered by brown and green landmasses and blue-green oceans.

VOA: special.2011.01.04

Many people think that the Industrial Revolution was the first time people began to have a major effect on the earth's ecology.

VOA: special.2011.04.26

Darwin said the Galapagos brought people near "to that great fact that mystery of mysteries the first appearance of new beings on earth."

VOA: special.2009.12.16

"This valley of history has seen mankind complete its first evolutionary steps into the universe: leaving the planet Earth and going forward into the universe.

VOA: special.2010.04.28

In the early eighteen hundreds in England, Mary Anning became one of the first women recognized for her discoveries about the ancient history of the Earth.

VOA: special.2009.05.13

On April twenty-second, nineteen seventy, environmental activists organized the first ever Earth Day.

VOA: special.2010.01.17

Also left forever on the moon is a sign with these words: "Here men from the planet Earth first set foot on the Moon July,nineteen sixty-nine A.D.

VOA: special.2009.07.15

When she was only twelve years old, Mary became the first person to find the almost complete skeletons of several animals that no longer existed on Earth.

VOA: special.2009.05.13

The Soviet Union had put the first satellite into Earth orbit.

VOA: special.2009.07.08

And my first very successful book was "The Good Earth."

VOA: special.2010.11.14

Twelve years before the historic Apollo 11 mission, the Soviets successfully launched the first artificial satellite called Sputnik into Earth's orbit.

VOA: standard.2009.07.16

Astronauts began their first full day in space by inspecting the heat shield to ensure the shuttle is safe to return to Earth in two weeks.

VOA: standard.2009.07.16