"I'm determined to prove botany is not the 'Cinderella of science'". That's what Professor Kathy Willis, Director of Science at the Royal Botanic Garden in Kew, told the Independent in 2014.

In the two years since she took on the job at Kew she's been faced with a reduction in government funding. So, Kathy Willis has been rethinking the science that's to be done by the staff of the Gardens - and been criticised for her decisions.

But as well as leading this transformation, Kathy has a distinguished academic career in biodiversity. She is currently a professor at Oxford University and, during her research career, she's studied plants and their environments all over the world, from the New Forest, when she was a student in Southampton, to the Galapagos Islands where she studied the impact of the removal of the giant tortoises on the vegetation there.

Jim al-Khalili discusses the future of biodiversity with Kathy Willis.