In Spain, cutting urban trees looks like national sport. These Swiss have just demonstrated that it is a mistake

There is only a handful of things that we know for sure about cities and one of them is that trees are key. And it is that the exposure to green spaces (and there the trees enter) “is associated with lower risks of mortality.”

It’s simple, it’s clear, it’s easy. And, despite this, we do not take note.

Wait, wait a moment … how? Yes and There are many reasons To do this: trees filter air pollutants, provide shadow, reduce ambient temperature in warm climates and encourage people to spend more time outdoors. They are a cheap and relatively accessible system to improve people’s lives.

But, as I say, when planting trees it is not so easy. Among other things because there is no space.

How can we plant trees to get maximum benefit? That is what They wondered Zurich ETH researchers. To do this, they examined high resolution data of the tree canopy to determine “the structure of the green tree spaces” within a radius of 500 meters of the place of residence of a person. Of six million people, actually.

AND They crossed this urban data with health and mortality information from the neighborhoods of Europe and Asia that analyzed.

What have you discovered? That both tree coverage in residential areas and its spatial distribution correlates with mortality. In fact, researchers They realized that the risk of mortality was “significantly lower in people living in neighborhoods with extensive, adjacent and well -interconnected areas of tree cups than in people who live in areas with less areas of fragmented tree glasses and with complex geometries.”

This seems true, in addition, if we discount other factors such as age, wealth, gender or educational level. It is true that the data are correlational and, therefore, do not allow to establish causal relationships; But the effect size makes all this very promising.

But, indeed, research is needed. “We are still in the early stages of this research”, The researchers explained. There are very basic things that are there to be clear: for example, they did not study the influence of specific factors such as pre -existing diseases, smoking or the same use of these green spaces.

A big problem … that affects us especially. And I say it affects Spain because Bad care that urban trees are given here is An endemic problem. The causes are diverse, yes; But they can be summarized in three: few media, mismanagement and isolated political decisions of any current technical knowledge.

Swiss study is just the last drop of a glass to be overflowing. Because we have known for a long time that trees help reduce atmospheric pollutants and mitigate the Urban heat island effect; But we don’t take it seriously. Nor do we go to take it.

Image | Vladimir Kudinov

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