Tucked away along the west Wales coastline is perhaps one of the most beautiful beaches in the country where a white-sailed boat bobs on aquamarine water that is so clear it's possible to watch crabs scuttle along the ocean floor. This is Porthlysgi, a secluded bay between St Davids and the harbour of Porthclais that's so tranquil it's hard to imagine we live on a planet threatened by environmental calamity.
The scale of one of those threats - single use plastic - is barely comprehendible: around 380 million metric tons of plastic are produced every year and humans use about 1.2 million plastic bottles per minute. Billions of bits of plastic end up in our oceans, lakes and rivers. And yet there is one UK company which has part of the solution, and the answer lies in those crystal clear waters off Pembrokeshire.
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