As the world celebrates the 200th anniversary of Charles Darwin's birth, David Shukman retraces his footsteps on the Galapagos Islands that are now threatened by tourism.
This week, the Shepherd family face their toughest trial yet. The transport challenge is underway, and for university student Jesse, giving up his car is a huge sacrifice. Over at the Edwards household, the transport challenge rules spark debate.
After living in darkness for a week, the Edwards family finally pass the water challenge and their energy hotspot is returned. Relieved and upbeat, they move on to the next hotspot challenge - a sixty percent reduction in their energy use.
The Amazon is one of the world's most unadulterated rivers - the most wild, the most remote. Seeing life on its banks is like stepping back in time... but for how long?
With a backdrop of tropical fauna and fauna images, a narrator explains how rainforests seed clouds with the aerobacter bacteria to form rain as part of a water and nutrient ecosystem.
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