year in the United States, cities grew at a faster clip than suburban
regions for the first time in a hundred years. Looked at another way,
we are in the middle of the largest mass migration in modern times.
Yet as humans shift their activities to cities, astoundingly little
planning, resources and infrastructure go into making those spaces
meet our psychological needs.
In Istanbul in the spring of 2013, eight people died and thousands
were injured in protests stemming from the proposed paving-over of
one of the last parks in the city, Taksim Gezi. Over 2 million of the
region’s trees had already been cut down to make way for a new
airport and a new bridge over the Bosphorus Strait. The park was
slated for a new shopping mall and luxury apartments. As bulldozers
entered the park to mow down the urban forest, citizens blocked their
way. They were willing to die for the last tree. “We will not leave
until they declare the park is ours,” said one twenty-four-year-old.
(As of this writing, the trees still stand, but their fate remains
uncertain.)
Taksim Gezi became a symbol not only of the importance of
nature to city life, but to democracy itself, just as Frederick Law
Olmsted knew all along. “A sense of enlarged freedom is to all, at all
times, the most certain and the most valuable gratification afforded
by a park,” he wrote.
Yet we think of nature as a luxury, not a necessity. We don’t
recognize how much it elevates us, both personally and politically.
That, ultimately, is the aspiration of this book: to find the best science
behind our nature-primed neurons and to share it. Without this
knowledge, we may not ever fully honor our deep, cranial connection
to natural landscapes.
Not far from where I sent my lichen-rock photo into the
Mappiness ether, two mighty rivers merge: the Green and the
Colorado. It makes me happy to think of this geography because of a
story of two goofy brothers I know, who, in college, built a raft out of