Contributor: with climate change, we may witness sequoia forests convert to chaparral

In downtown L.A., in the parking lot of the Automobile Club of Southern California, sits a quaint monument, one century old. It’s a cross section of a giant sequoia, propped on its side,

with arrows pointing to tree rings marking era-defining events. Meanwhile, in the Sierra Nevada, thousands of crown-scorched sequoias stand dead as de facto monuments of climate change. With

both kinds of de-immortalized Big Trees, Californians can see connections between civilizational time and the temporal condition called the Anthropocene. The AAA timeline at West Adams

Boulevard and Figueroa Street was one of many derived from a single fallen tree in Sequoia National Park. Starting in 1923, the park’s superintendent freely supplied slabs to educational

institutions, as long as recipients paid shipping. With each 1.5-ton piece, the National Park Service sent interpretive instructions, including a list of historical events — though no

guidance on finding the correct corresponding rings. By handpicking pivotal moments, curators revealed prejudices. The most variable tag was the penultimate one, for which they turned to

whatever appeared to be the latest world historical happening before the felling of this particular mammoth tree — “World War begun” or “Automobile Club founded.” The earlier tags repeated

themselves. I know because I obsessively tracked down 25 cross sections — mostly giant sequoias, plus a few coast redwoods — installed throughout the country in the first half of the 20th

century. The following events appeared with greatest frequency: • American Revolution/Declaration of Independence (22) • Discovery of America by Columbus (21) • Pilgrims/Mayflower (14) •

Norman Conquest/Battle of Hastings (13) • Magna Carta (12) • First/Second/Last Crusade (12) • Charlemagne crowned (11) • Civil War begins/ends (10) • Leif Erikson/Vikings in America (10) •

Muhammad born (10) • Fall of Rome (9) These timelines — artifacts of white supremacy — condensed a civilizational narrative: A divinely ordained course of empire moves westward from the Old

World to the New, from Christian Rome to Reformation England to the twice-born U.S. republic, with its empire of liberty serving as the endpoint of progress, the final stage in historical

time. In this wooden enforcement of collective memory, famous men carry the banner of advancement. The prominence of Vikings reflected the eugenical valorization of the “Nordic race,” as

well as the efforts of Scandinavian immigrants to claim American heritage. Muhammad’s salience is also explicable. WASPy curators would have preferred a marker at AD 0 — “Jesus Christ born”

— and, indeed, some went ahead and added the Nativity. Honest ones knew that sequoia slabs available to museums were not quite old enough to be coeval with Christ, and they accepted the

prophet (tagged at AD 570) as an Abrahamic placeholder. These timelines ignored California’s precolonial past. The supposed Point Reyes landing of Sir Francis Drake occasionally merited

mention, as did the founding of Spanish missions, but the Golden State before conquest was literally timeless. The privileging of fixed points in linear time nearly guaranteed the erasure of

Native histories, irreducible to dated or datable events. The only Indigenous peoples who sometimes got matched to tree rings were Maya and Aztecs, calendrical peoples who comported with

Western ideas of civilization. The generation of land managers who pinned these tags to sequoia slabs also instituted, with corresponding certitude and racism, the policy of fire suppression

in the Sierra Nevada. They attributed a dearth of young sequoias — a fire-adapted species with flame-released cones — to the “savage” pyromania of California Indians. They mocked “Piute

forestry.” Suppression became such a shibboleth that Congress in 1922 forbade the use of Sequoia National Park’s firefighting funds for “precautionary fires,” later known as prescribed or

controlled burning. In 1967, federal land managers began to reverse the suppression policy and designated Sequoia National Park as a flagship experiment. The appearance of sequoia seedlings,

then saplings, testified to the efficacy of prescribed burning. Famous groves got the treatment first. Unfortunately, the slowness of the process — years of planning, followed by waits for

weather windows and political windows — prevented rangers from burning the whole park once, or even all its ancient groves once, before megadrought began in 2000. The ongoing aridification

is epochal. Using tree rings as proxies for snowpack and summer soil moisture, scientists have determined that this 20-plus-year period is the driest in southwestern North America since AD

800. They attribute nearly half the intensity to anthropogenic forces. In other words, humans’ heat-trapping emissions have turned a normal drought into a 1,000-year drought. Speaking

historically, and truthfully, “anthropogenic” is a euphemism for the Global North, especially the British Empire and the United States. The same post-1960s generation that adjusted fire

policy began to revise the California redwood timelines on display at reserves and museums. In response to multiculturalism, the lineup of historical events became more politically correct,

though no less androcentric. Today, in a post-truth period of extreme partisanship — a conflagration for U.S. democracy — one could imagine an executive order to ban “critical race theory”

from national parks, or just the opposite, a Sacramento directive to California state parks to inscribe replacements for the Mayflower’s landing and the Gold Rush: 1619, arrival of the first

enslaved Africans in Virginia; 1846, onset of the California genocide. In 2021, amid a record fire season, the California Legislature passed two bills designed to encourage controlled burns

throughout the state, following the historical example of Native peoples, including participation of “cultural burning liaisons.” This would-be pivotal moment came too late for many sequoia

groves in the southern Sierra. There are good fires, bad fires and terrifying fires. With snowpack melting sooner and faster, and with associated declines in soil moisture and summer

humidity, lightning sparks can become superhot infernos that scorch instead of rejuvenate fuel-loaded ecosystems. In the span of one human lifetime, Californians may be witnessing forests of

millennial giants convert to chaparral. Tagged on a timeline, 2020-2021 can be grimly summarized: 1 in 5 elders of the planet’s superlative plant, a supremely fire-resistant species, goes

up in flames. In reaction to this unprecedented mortality, the U.S. Forest Service announced emergency action to reduce fuel loads in groves in its jurisdiction. In July, the manageable

effect of the Washburn fire on Yosemite’s iconic Mariposa Grove — which the park service had treated for decades with prescribed burning — reinforced the wisdom of this move. But local

efforts cannot stop planetary processes. Unless the Biden administration’s Inflation Reduction Act is the first of many future climate bills, no amount of backfiring, sprinkling or

foil-wrapping will alter the long-term outlook for big old trees. In the Sierra, they will disappear except for a limited number of intensely managed groves — de facto botanical gardens, or

tree museums. As the drying of California goes on, could cohorts of dead sequoias become lasting monuments of warning about historical hubris? The connected struggles for climate action and

civil society will tell. In an optimistic scenario, a political majority in the U.S. will reform old habits of temporal thinking and respond to the demise of emblematic elderflora without

invoking the rise and fall of civilizations, or any kind of end times. In the past, so much harm has been done by those possessing certitude about the inevitable outcome of history. No one

has ever known how the timeline ends, and that enduring uncertainty should be reason for hope in action. _Jared Farmer is a professor of history at the University of Pennsylvania, and the

author of “Elderflora: A Modern History of Ancient Trees.” @geohumanist_ MORE TO READ