"What have those trees seen and experienced and recorded in their DNA, in their rings, in their life? It's important," Milarch said.
Ruskin Hartley is the executive director of Save the Redwoods, a 90-year-old San Francisco-based nonprofit group that protects and preserves old-growth forests.
He said the cloning project taps the mystique of ancient redwood trees, but he questioned whether using clones for widespread restoration is necessary or appropriate.
Redwoods can already naturally reproduce using clones, Hartley said. The parent trees send out new sprouts from their bases and fallen limbs, which grow as exact copies of their parents. The trees also reproduce with seeds.
Although more than 95 percent of the ancient redwood forests have been logged, Hartley said many of the damaged forests now sport naturally regenerated young redwoods from clones and seeds.
Over hundreds of years, some of the young forests will survive and take on the old-growth characteristics that naturally come with age.
"So I don't think it's necessary to clone an ancient tree to regrow a redwood forest," Hartley said.
"The only way that you can really go about restoring the ancient forest is waiting a really long time—that's the essence of the oldness of these forests."
Hartley is also concerned that the clones could mix up the gene pool, since there is regional diversity within the species.
The Champion Tree Project plans to avoid mixing by taking genetic samples from at least five sites along the California coast.
The group will also use local clones for local forest regrowth, Milarch noted.
But Hartley said a more appropriate use of the cloned redwoods would be to beautify someone's property.
"If an individual wanted to take one of those clones and plant it in their backyard because they have a big backyard, would that be a concern? No, not really," he said.
To create the clones, foresters will collect tissue samples from the tips of branches—the newest growth areas on a tree, said David McMaster, a project collaborator for Bartlett Tree Experts, a national tree care and service company.
On a thousand-year-old redwood, this so-called budwood is found on branches more than 250 feet (76 meters) high, in the crown. (Watch a video about the world's tallest tree.)
"To go up 250 feet in a tree is pretty phenomenal in and of itself," McMaster said.
Tree climbers with ropes and harnesses will venture into the crown of several old-growth redwoods at Roy's Redwoods Open Space Preserve in Marin County, California.
From there, the climbers will snip off young branches and lower them to the ground.
Budwood from the tips of the branches will be put on ice and shipped to a nursery in Carmel, where the clones will be developed using four different techniques:"t-budding," taking budwood and inserting it beneath the bark of a host tree; root grafting, which attempts to establish new growth onto root stock; tissue culturing, or growing new tissue in a laboratory; and use of a moisture chamber to get the budwood to establish roots on its own.
"You're not 100 percent successful in any one of the ways, [but] we'll undoubtably be successful in one way or another at all four in varying degrees," McMaster said.
Once the young saplings are established, the project team will begin planting the clones at select sites along the California coast within a few years.
Milarch said his organization has yet to determine the most appropriate place to plant the clones.
But "with 97 percent of those sites with coast redwoods gone, there's plenty of opportunity," he said.
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