The devastating effect humans are changing the planet by these stunning now and then pictures

A series of photos shows how quickly the Earth is changing, including before-and-after pictures of the parched Aral Sea (above), the shrinking Mar Chiquita in Argentina (below), Alaska's melting Muir glacier and the urban sprawl of Beijing. NASA has been curating these photos since 2009, in a series called Images of Change. While many of the photos show the devastating effects of climate change, some of the photos reflect positive changes like the regrowth of forests in Uganda.