Billions of tons of plastic have been made over the decades, but around 90 percent of it hasn't been recycled.

Plastic in itself is not so hard to recycle. The problem is that it's actually too cheap and simple to produce from residues from refineries and from the gas industry.

Emma Keeling is in Sweden, where Professor Heinrick Thunman and his team has developed a process that can chemically recycle all kinds of plastic so that future production will not have to use more fossil fuels.