Adam Walton visits Llanelli Wildfowl and Wetlands Centre to meet ecologist Brian Briggs.
Adam Walton meets scientists investigating rumours of a jellyfish population explosion.
Adam Walton takes a closer look at grasses and discovers why they are so important.
Adam Walton explores Earth's past and future mass extinctions.
Adam Walton visits three archaeological digs, finding out how technology reveals the past.