A 1984 scientific paper revealed to her that people recover from gallbladder surgery faster in hospital wards that have a view of trees than those that look out onto brick walls.
Willis unearthed many large data studies that show the relationship between plants and human health, revealing the effect of urban tree loss on increased mortality rates.
She began to do 'forensic work' to grasp 'how we are physically and mentally affected when our senses of sight, sound, smell and touch interact with nature'.
As her inspiring book concludes: 'We cannot survive without a diverse nature around us.'
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