On Earth, the past is even quicker to vanish. To study geology is to be astonished at how hastily time reorders our planet’s surface, filling its craters, smoothing its mountains and covering its continents in seawater. Life is often the fastest to disintegrate in this constant churn of water and rock. The speed of biological decomposition ensures that only the most geologically fortunate of organisms freeze into stone and become fossils. The rest dissolve into sediment, leaving the thinnest of molecular traces behind.
Part of what separates humans from nature is our striving to preserve the past, but we too have proved adept at its erasure. It was humans, after all, who set fire to the ancient Library of Alexandria, whose hundreds of thousands of scrolls contained a sizable fraction of classical learning. The loss of knowledge at Alexandria was said to be so profound that it set Western civilisation back 1,000 years. Indeed, some have described the library’s burning as an event horizon, a boundary in time across which information cannot flow.
The burning of books and libraries has perhaps fallen out of fashion, but if you look closely, you will find its spirit survives in another distinctly human activity, one as old as civilisation itself: the destruction of forests. Trees and forests are repositories of time; to destroy them is to destroy an irreplaceable record of the Earth’s past. Over this past century of unprecendented deforestation, a tiny cadre of scientists has roamed the world’s remaining woodlands, searching for trees with long memories, trees that promise science a new window into antiquity. To find a tree’s memories, you have to look past its leaves and even its bark; you have to go deep into its trunk, where the chronicles of its long life lie, secreted away like a library’s lost scrolls. This spring, I journeyed to the high, dry mountains of California to visit an ancient forest, a place as dense with history as Alexandria. A place where the heat of a dangerous fire is starting to rise. (...)
The world’s oldest trees, bristlecone pines belong to a group of ‘foxtail’ pines that live in small alpine pockets of the western United States. Foxtail pines are hardly newcomers to this Earth. Their oldest fossil ancestor dates back more than 40 million years, to the Eocene, the epoch when modern mammals first emerged. Though today the trees are found at between 2,700 and 3,500 metres, their range fluctuates considerably with climate. Because the trees like things dry and frigid, they extend their reach downward in cool, glacial times and recede to high ground in warm periods. In California, foxtail pine fossils have been found as low as 1,500 metres, no doubt the denizens of a previous ice age.
The oldest of the living bristlecones were just saplings when the pyramids were raised. The most ancient, called Methuselah, is estimated to be more than 4,800 years old
In March this year, I paid a visit to these extraordinary beings on an arid strip of dolomite atop California’s White Mountains. Located just north of Death Valley, the White Mountains are some of the driest on the planet. Visiting the trees in March meant trudging several miles through snow at just over 2,700 metres, as road access to the bristlecones is closed through May. It also meant that the forest was empty, as deserted of human beings as it has been for all but a brief flicker of its history.
It is hard to resist cliché when conveying the antiquity of the bristlecone pine. The oldest of the living bristlecones were just saplings when the pyramids were raised. The most ancient, called Methuselah, is estimated to be more than 4,800 years old; with luck, it will soon enter its sixth millennium as a living, reproducing organism. Because we conceive of time in terms of experience, a life spanning millennia can seem alien or even eternal to the human mind. It is hard to grasp what it would be like to see hundreds of generations flow out from under you in the stream of time, hard to imagine how rich and varied the mind might become if seasoned by five thousand years of experience and culture.
by Ross Andersen, Aeon | Read more:
Photo: Nick Paloukos
