We are being watched. A bewildering array of sensors are remotely observing everything on earth, from crops in Africa to the car parked outside your house.  Will these aerial observations help us to save the Earth, or is science beginning to see too far into our lives?

A BBC/OU/Vega Video.

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How has satellite imaging improved in the last fifty years, and what are the implications for privacy, earth observation and geosciences?

Chaired by Colin Blakemore, the panel consists of Robert Llewellyn, Robert Gurney, David Baker and panel regular, Jacqui McGlade.