Tom Heap meets a man who can turn dirty water into clean, drinkable water.
Cleaning the seabed, one dive at a time. Miranda Krestovnikoff joins a new clean-up squad.
Tom Heap discovers how the islands of the Caribbean are preparing for rising sea levels.
Tom Heap visits communities living with the shale gas industry, from Texas to Lancashire.
Tom Heap finds out how communities large and small can produce their own electricity.
Weatherman Peter Gibbs investigates the global impact of the weather phenomenon El Nino.
Jheni Osman is on the front line against invading mosquitoes and new disease threats.
Tom Heap explores how four years of drought is changing the face of Texas.
How the rise in diesel cars may have damaged our health. Tom Heap investigates.
Britain's Overseas Territories are a treasure trove of wildlife. Tom Heap reports.