A new study out of Denmark has just found that growing up near green space can reduce one's risk of mental illness by up to 55 percent. Furthermore, according to the study, "the effect of green space was 'dosage dependent' — the more of one's childhood spent close to greenery, the lower the risk of mental health problems in adulthood."
Preserving land ensures children not yet born will have greenery to enjoy. Yes, it's true - land preservation makes the world a saner place!

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