Plot: Over a century of public service broadcasting, the BBC has forged a global reputation for its coverage of the planet we call home – from the oceans and mountains to rivers, glaciers, deserts and the infinite wonders of life on Earth itself. Tonight, the Proms hosts a stunning audio-visual celebration of the BBC’s world-famous Natural History Unit, from David Attenborough’s pioneering early adventures through to the landmark series of the 21st century