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Amidst the rolling green hills of Snowdonia National Park, glowering across a reservoir fresh with fish and fauna, sits the now defunct Trawsfynydd nuclear power station. Although it was closed in 1991, the area will remain radioactive for millions of years. Broadcaster and environmentalist Iolo Williams visits Trawsfynydd to discover innovative ways that science and technology are being used to decommission redundant sites. He also explores how new processes could lead to greener nuclear energy in the future.