Landfill sites are an icon of our wasteful society and the harm we cause to Planet Earth.
But around the world, people are trying to make these filthy places a little bit better.
We visit the human-built island in Singapore made of burned waste that has become a thriving ecosystem.
And in France, we hear how gas leaking from landfill sites is being collected as a source of energy.
Presenter: Myra Anubi\nReporter/producer: Claire Bowes\nSingapore reporter:Tessa Wong\nSeries Producer: Jon Bithrey\nEditor: Bridget Harney\nSound mix: Annie Gardiner
email: peoplefixingtheworld@bbc.co.uk
(Image: Semakau island, Singapore National Environment Agency)