The world is transforming all the time and in this TV special, viewers can see the extent of those changes in an extraordinary way. Astronauts present images from the NASA archive taken from space across the last 45 years. By using incredible time-lapse sequences, they show how humanity is changing the world for better or worse. Viewers can see what the rapid growth of “mega-cities” like Tokyo and Delhi looks like from space, but the death of rain forests and disintegration of glaciers is also evident. The documentary’s starting point is ‘Blue Marble’ – the famous photograph taken of Earth from space in 1972 by the Apollo 17 crew.