In honor of Earth Day today, the Gold Box spotlight deal of the day over at Amazon is Life/Planet Earth: Special Edition DVD and Blu-ray for 54% off.

This set combines two popular BBC nature series — Life and Planet Earth — both narrated by David Attenborough.

– Life/Planet Earth: Special Edition Blu-ray – $54.99 (down from $119.98)
– Life/Planet Earth: Special Edition DVD – $45.99 (down from $99.98)

Note, this deal is valid only for today, Sunday, April 22, 2012, until 11:59pm PST while supplies last.

From the product page:

Planet Earth: Special Edition
– Commentary on select episodes
– Great Planet Earth Moments – Relive the greatest moments of this revolutionary series and discover how these scenes were captured on film!
– Snow Leopard: Beyond the Myth – The BBC Natural History Unit explores a secret cave deep in the mountains of Pakistan where generations of snow leopards return each year to raise their young.
– Secrets of the Maya Underworld – The freshwater pools that dot Mexico’s Yucatan peninsula were believed by the Mayans to be portals to the underworld. For the first time ever, the BBC Natural History Unit explores this incredible, labyrinthine system of underground rivers.
– Elephant Nomads of the Namib Desert – Follow the struggle for survival of two female elephants trying to raise their young in one of the harshest climates on Earth.
– “Music Only” viewing option
– Special Sneak Peek at Executive Producer Alastair Fothergill’s next blockbuster project: Frozen Planet (TBC)

Original DVD Special Features now also on Blu-ray:
– 110 minutes of behind the scenes footage – one 10-minute behind the scenes program for each episode
– Planet Earth – The Future – This 3-part series looks at what the future may hold for endangered animals, habitats and – ultimately – ourselves. Following the environmental issues raised by Planet Earth, it asks why so many species are threatened and how they can be protected in future.

Life
– Life on Location – A collection of ten behind the scenes video diaries, found at the conclusion of each episode, showing the exhaustive efforts by the filmmaking team to bring this remarkable series to the screen.