Gavin twitches back the Iron Curtain and crosses into the former Soviet Bloc. First stop is Bratislava, capital of Slovakia where Gavin walks in the footsteps of Napoleon and sees how town planners are ruining the city.
In the magnificently stark landscape of the Bolivian highlands lies Tiwanaku, a 2000-year-old city that was home to one of the most influential civilisations in pre-Inca South America. Scattered throughout this remarkable metropolis are huge temples, pyramids and delicately carved monoliths constructed from colossal slabs of stone. But Tiwanaku's beauty comes with an equally beguiling mystery. The nearest quarry that could have produced the city's rocks lies some 40km on the other side of Lake Titicaca, the second largest lake in South America. How could these multi-ton stones possibly have made their way to Tiwanaku?
The penguins of the Antarctic lead extraordinary lives, their home is the coldest, windiest and driest place on the planet. These flightless birds manage to cope with such extremes, but how will they survive the even greater challenge of climate change?
It's the penultimate episode of the series and the Edwards are struggling to pass the transport hotspot challenge. All out of solutions, Eco Coach Tanya decides to exploit a loophole in the challenge which results in the Edwards meeting their transport target.
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?
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