Clearing up pollution can be a messy and expensive task, but around the world people are harnessing the power of plants to do the job for them. We hear how water hyacinths are going from hated weed to providing communities with a greener water filtration solution; how plants in the Niger Delta are helping rejuvenate land drenched in oil and devastated by fire and ask whether plants could be the future to more environmentally friendly mining. Presenter: Myra Anubi Reporter: Georgina Rannard Reporter/producer: Lizzy McNeill Producer: Zoe Gelber Series producer: Tom Colls Sound mix: Hal Haines Editor: Penny Murphy Email: peoplefixingtheworld@bbc.co.uk Image: A water hyacinth (Getty Images)