(原创听录)HOME---《地球美丽有赖你》（2）---一部超级经典唯美环保记录片

    (Notice: MUSIC means there is a pause more than five seconds, sometimes with music, sometimes not. )

 but the earth had an exceptional future, offered to it by water. at the right distance from the sun, not too far, not too near, the earth was able to conserve water in liquid form. water vapor condensed and fell in torrential downpourson earth and rivers appeared. the rivers shaped the surface of the earth, cutting their channels, furrowing out valleys. they ran toward the lowest places on the globe to form the oceans. they tore minerals from the rocks, and gradually the fresh water of the oceans became heavy with salt.(music)

water is a vital liquid. it irrigated these sterile expanses. the paths it traced are like the veins of a body, the brancehes of a tree, the vessels of the sap that it brought to the earth.(music)

nearly four billion years later, somewhere on earth can still be found these works of art, left by the volcanoes' ash, mixed with water from iceland's glaciers. there they are---matter and water, water and matter---soft and hard combined, the crucial alliance shared by every life-form on our planet.(music)

minerals and metals are even older than the earth. they are stardust. they provide the earth's colors, red from iron,black from carbon,blue from copper, yellow from sulfer.(music)

where do we come from? where did life first spark into being? a miracle of time. primitive life-forms still exist in the globe's hot springs. they give them their colors. they are called archaeobacteria.(music)

they all feed off the earth's heat, all except the cyanobacteria, blue-green algae. they alone have the capacity to turn to the sun to capture its energy. they are a vital ancestor of all yesterday's and today's plant species. these tiny bacteria and their billions of descenants changed the destiny of our planet. they transformed its atmosphere.

what happened to the carbon that poisoned the atmosphere?

it's still here,imprisoned in the earth's crust. we can read this chapter of the earth's history nowhere better than on the walls of Colorado's Grand Canyon. they reveal nearly two billion years of the earth's history.

once upon a time, the grand Canyon was a sea inhabited by microorganisms. they grew their shells by trapping into carbon from the atmosphere dissolved in the ocean. when they died, the shells sank and accumulated on the seabed. these strata are the product of those billions and billions of shells.(music)

thanks to them, the carbon drained from the atmosphere, and other life-forms could develop.

it is life that altered the atmosphere.

plant life fed off the sun's energy which enable it to break apart the water molecule and take out/off the oxygen. and oxygen filled the air.