Mike Williams asks Cyprus' residents what the wall means to them
Multi-millionaire Paul Lister on his plans to make money from conservation
The threats to the world's oceans from overfishing and pollution
Talking about the quality, care and long term survival of the world's rivers
Housing ministers gather in the UK to discuss the world's slums
James Smith the chairman of Shell UK on carbon trading and the global energy challenge
Achim Steiner from the United Nations on the Copenhagen Climate Change Conference
Talking about the global outbreak of swine flu and the emergence of other pathogens
The historic decision by the US government to classify carbon dioxide as a pollutant
Talking about US rocker Neil Young's eco car obsession and Michael Jackson's Earth Song
A visit to a research laboratory reveals how towns can be built to withstand earthquakes
One Planet talks population growth with US government advisor Dr Nina Fedoroff
The new products and traditional skills of the nomads of Kenya and northern India
Why is northern Russia is getting warmer and how are its inhabitants coping?
Rupa Jha reports on the Dalit community's battle for better working conditions
One city's astounding solution to mining-related subsidence
What can be done to fix the world's topsoil and is there the political will to do it?
Has the electric car revolution finally arrived?
Why is Israel experiencing one of its worst droughts since modern records began?
Is Phoenix Arizona the model for a new kind of US city or perched for a big fall?
With James Speth, Caroline Lucas, and Bruce Babbitt
The scientists and specialists laboratories searching for a cure
As populations grow, is nuclear power the answer to Africa's chronic energy crisis?
Could algae help solve the world's environmental problems and become as valuable as oil?
Could solar power from the Saharan desert be the future of electricity for Europe?
Could an eco-town in Sweden be a model for cities under strain?
Does recycling plastics on an industrial scale make economic sense?