The open valley turns to a forest of tall fir trees, many hung with moss.
Hillen says the community never expected to see the memorial grow so quickly, from a few saplings to what now seems like a forest of nearly 300 trees.
The production, created for the Welsh National Opera, was abstract and minimalist: Johan Engels's design featured a semicircle of dark bleachers and a forest of tilted black crosses that appeared intermittently, representing trees or pillars, and serving as a reminder of the overwhelming power of the Catholic Church.
It resembles a woodland, in which isolated knots of trees surround a few dense thickets of forest.
When Adams arrived in town, the school site was a dense forest of sweet gum and pine trees.
And when they go into the forest, they also damage a lot of the trees we need.
The site is a panoramic ground on the edge of the Jerusalem Forest of pine and cypress trees.
Drive east and you see the same, an undulent landscape carpeted with buildings completed or under construction, roads thick with traffic, and a few forlorn patches of the original Atlantic Forest or more recently transplanted eucalyptus trees to break up the relentless jumble of concrete.
He said that there had been a "tremendous reduction" in the total number of trees in the forest.
Removing small trees and brushwood from a forest requires heavy machinery or large teams of workers with chainsaws and axes.
There's a very thick pall of smoke which smells kind of like a mixture of menthol and charcoal because there are quite a few eucalyptus trees in the forest.
"It may sound counter-intuitive, but performing well in a fire is something inherent in large piece of wood, that's why in forest fires the trees that survive are the largest ones, " he says.
Sustaining existing forest cover, planting new trees and better management of land use is also suggested as a means to slow global warming.
BBC: Impact of global warming may be severe and wide-ranging
Park authorities built a raised walkway through the forest, so you can leave the boat and wander through the trees or go for a dip in one of the freshwater springs.
But talk of financial incentives for forest-owners to preserve their trees is in the air, and a deal may be struck at the United Nations climate-change meeting being held in Copenhagen in December.
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