Our oceans are threatened by plastic pollution and overfishing. Kim Chakanetsa speaks to two pioneering women who are working to sustain our seas.

Asha de Vos is a marine biologist who founded Oceanswell, Sri Lanka's first marine conservation and research organisation. Asha's particular research interest is blue whales. She says every stretch of coastline needs its own local hero, and it doesn't have to be a scientist.

Emily Penn is a British oceans advocate and skipper who founded eXXpedition - a series of all-female sailing voyages around the world. These trips always include a group of non-sailors from different countries, and their aim is to raise awareness and find solutions for the impact of single use plastic on the ocean.

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L: Emily Penn (credit: Emmanuel Lubezki)
R: Asha de Vos (credit: The Schmidt Foundation)