Tom Heap visits the Scottish island that can power itself.
Peter Gibbs finds out if the ozone layer hole is healing 30 years on from its discovery.
How will the next government tackle Britain's environmental problems? Tom Heap reports.
China needs more water urgently. Isabel Hilton examines the nation's options.
Tom Heap investigates whether eco-cities are living up to their promise.
Tom Heap saddles up to find out if Britain is really about to become a nation of cyclists.
Could the revival of the pine marten be bad news for grey squirrels and good for the reds?
With Antarctic sea ice growing, Tom Heap asks what is happening to the climate.
Tom Heap asks what the falling price of oil means for the environment.
Tom Heap meets the scientists trying to lessen the impact of volcanic eruptions.