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"The shore was totally contaminated, it looked as if it had been scorched and the air was heavy with the stench of oil."

Peter Derinder of the University of Wales recalls the oil spill that occurred off the coast of Pembrokeshire.

Also on the programme Ashley Wilson talks about a foam containing micro-organisms that can deal with oil pollution, the Wai-wai people of Guyana and hornbill's role in saving rainforests in west Africa.

Presented by Jill Neville.