here). More access to green spaces means: less liklihood of developing asthma or allergies; lower levels of stress; greater likelihood of a more active lifestyle; greater opportunities to mentally and physically engage with the natural world. Promoting good health was always one of the key reasons why Bristol should be protecting and increasing its green spaces not flogging them - and protecting its green belt from inappropriate developments like the proposed South Bristol Ring Road/Link and the Bristol City stadium (picture shows Ashton Vale green belt) .
"Urbanisation is a relatively recent phenomenon, and for most of our time we have been interacting in an area that resembles what we now call the natural environment," he said.
"Urbanisation can be seen as a lost opportunity for many people to interact with the natural environment and its biodiversity, including the microbial communities."
While it was not possible to reverse the global trend of urbanisation, he said that there were a number of options.
"Apart from reserving natural areas outside of urban areas, I think it is important to develop city planning that includes green spaces, green belts and green infrastructure," Dr Hanski suggested