How one professor uses 'Walden' to study climate change

See the plot of land where Thoreau built his Walden cabin

Harvard's Lawrence Buell takes viewers down to Walden Pond to show them the spot in the woods where Thoreau constructed his modest cabin. Along the way, he reads from "Walden" and explains why Thoreau's text still matters 170 years after its publication.

Tourists flock to Walden Pond, the namesake for Henry David Thoreau's book 'Walden,' from across the globe.

Diving into the life of Henry David Thoreau

Before he went to live in the woods by Walden Pond, Thoreau (who originally went by David Henry) lived a fascinating life, opening a school with his brother, working for his father's pencil-making business, and becoming close to Ralph Waldo Emerson, who'd become a mentor figure for the aspiring writer. This deep profile explores all that and more.

Busting the myths about Thoreau's 'Walden'

This resource from The Walden Woods Project dispels some of the common myths about Thoreau's time in the woods, including that he was a hermit (he actually regularly visited friends), that he was freeloading (he paid off his debts), that "Walden" was a misrepresentation (he was forthcoming about editing his experiences), and that he was opposed to progress (he believed in practical technology).

Browse the original 'Walden' manuscripts

Henry David Thoreau began writing the book about his time living at Walden Pond in 1846, but it went through seven iterations before being published in 1854. You can look through scans of early proofs, including some of Thoreau's handwritten corrections, through the Huntington Digital Library.

In 2024, Walden Pond was listed as an endangered place

The National Trust for Historic Preservation listed the site of Henry David Thoreau's "Walden" experiment as one of the most endangered historic places in America due to a proposed airport expansion and the proposed development of a nearby plot of land.

Henry David Thoreau's 'Walden' is a popular text with young people in China exhausted by the country's emphasis on achievement.

The political theory of Henry David Thoreau

The two years, two months, and two days that Thoreau spent living in a modest cabin at Walden Pond informed his beliefs that people should live simply, deliberately, and become self-reliant. Those beliefs were later articulated, in a political sense, in his landmark essay, "Civil Disobedience."

Read the works of Henry David Thoreau, including 'Walden' and 'Civil Disobedience,' for free.

Read the poetry of Henry David Thoreau

Although primarily known for his nonfiction, the New England transcendentalist was also a prolific poet, writing verse that, like his essays, tackled nature, man, and society. The Academy of American Poets has collected 30 of his poems, which you can read for free.

Why Henry David Thoreau was not a hermit

When many people think of "Walden," they think of a man who intentionally exiled himself from society. But that's inaccurate. Thoreau regularly welcomed guests and explained that he kept three chairs in his modest cabin: "one for solitude, two for friendship, three for society."

Well before the publication of 'Walden,' Henry David Thoreau nearly burned down his hometown with an unruly campfire.

Unpacking Thoreau's diet, which once included a woodchuck

The writer's diet was notoriously simple, preferring an inexpensive combination of rice and vegetables to meat, though he usually ate it when offered. In "Walden," he mentions eating a woodchuck after it got into his beans, which one Thoreau biographer said was likely true.

Henry David Thoreau's family's pencil-making company helped fund the transcendentalist writer's books.

A prominent writer analyzes Thoreau's apparent contradictions

Some call Thoreau a monkish hermit living in the woods, while others say he's a privileged layabout who was playacting a simple life. In this essay, Rebecca Solnit argues that both of those assessments are caricatures that reduce a complex man who reckoned with complex ideas.

Why David Attenborough was skeptical about global warming before bringing attention to it

Believing he was "experiencing the untouched natural world" in his early documentary series, Attenborough has admitted that many of his assumptions about human action were incorrect. It was not until attending a 2004 lecture on greenhouse gases and global temperatures that he became convinced of the science.

Climate data is monitored globally using tools from satellites to backyard gauges

Scientists use satellites, balloons, ocean buoys, and land-based instruments to track climate variables like temperature, precipitation, and wind. These tools gather data from deep ocean waters to the upper atmosphere.

Understanding Thoreau's critique of American work

John Kaag, a coauthor of "Henry at Work: Thoreau on Making a Living," explains how the writer is often mischaracterized as a layabout who avoided responsibilities. Kaag, though, notes that Thoreau was a jack-of-all-trades—working as a schoolteacher and a handyman, and even for his father's pencil-manufacturing company—who came to believe that relentless striving was getting in the way of authentic living.

Why Thoreau considered himself spiritual but not religious

This interview with Richard Higgins, author of "Thoreau's God," unpacks the writer's deep spirituality, which underlies his exploration of "deliberate" living. Higgins notes that Thoreau was opposed to the dogma of organized religion but took his spirituality seriously, treating July 4, 1845, when he moved to Walden Pond, as his own "spiritual independence day."

The weather time machine

A fun interactive on how old ships’ logs are giving scientists new insights into the past and future of the Earth’s changing climate (w/maps and pictures).

David Attenborough reflects on some of his most moving natural encounters

The legendary natural historian has had more direct encounters with wildlife than most people in history. As he turned 99, the Englishman recounts his favorite encounters with marine life, from whales to capuchin monkeys in mangroves. Despite the obstacles the environment faces, Attenborough believes in nature's resilience.

Read 10 of the best quotes about nature from David Attenborough

From reflecting on the interconnectedness of life and humanity's shared responsibility to protect biodiversity to the power of young people in driving change and understanding nature's beauty and importance, this list highlights some of the most noteworthy things said by the famed natural historian.

The field of attribution science seeks to determine whether specific phenomena, such as melting glaciers, droughts, and hurricanes, are driven by Earth's natural climate cycles or by human-caused climate change.

Scientists use climate proxies—physical, chemical, and biological materials preserved in sediments, ice, and fossils—to infer historical climate data and determine past climate patterns.

Explore a series of interdisciplinary explainers on climate science

From animations on the quantum mechanics of greenhouse gases to a photo essay on how scientists acquire climate data, this collection provides detailed explorations of how different branches of science have contributed to our understanding of climatology.

A map of extreme weather events and their links to climate change

To track how the evidence on this fast-moving topic is stacking up, Carbon Brief has mapped every extreme-weather attribution study published to date. Read more about the findings from the comprehensive analysis.

Climatologists use past data and advanced models to forecast future climate trends

Unlike meteorology, which focuses on weather forecasting over several days, climatology identifies trends in data over periods of 30 or more years. This data can go back millions of years and help refine models to forecast centuries into the future.

Hear the story of the early American environmentalists who shaped the public lands we enjoy today.

The long-tail influence of Thoreau's 'Civil Disobedience'

His essay "Civil Disobedience" laid out both a practical and a moral plan for resisting unjust governments, inspiring civil rights leaders like Mahatma Gandhi and Martin Luther King Jr., as well as anti-war anarchists like Emma Goldman and literary figures like Leo Tolstoy.

Sci-fi writer Jeff VanderMeer writes dystopian fiction about the environment

Noted science fiction writer Jeff VanderMeer discusses his 2014 novel "Annihilation," which uses climate change as a dystopian frame. VanderMeer notes that he’s not interested in cynicism, even though that’s how most people view dystopian literature. “I’m not a fan of fiction that’s totally hopeless,” VanderMeer says. “You find ways of documenting the world as it is and you wind up redefining utopia and dystopia.”

Discover trends in Earth's climate system: What are indicators of climate change?

A comprehensive deep dive tracking components of the climate system over time, such as temperature, sea level, sea ice amounts, ocean heat, greenhouse gases, and more (w/charts and graphs).

Watch a time-lapse from space of photosynthesis across Earth

Using NASA satellite imagery, carbon absorption can be tracked and serves as a proxy for photosynthetic activity on land and in the oceans. Over the course of a year, seasonal changes can be observed as plants become dormant in the fall and active again in the spring.

See Harvard’s early history through Indigenous voices

Founded in 1636, Harvard University grew alongside English colonization in Wampanoag lands. In this online exhibit, the Peabody Museum of Archaeology and Ethnology highlights Indigenous voices, interpreting objects such as eel traps and grass baskets.

Hear 2 literature professors unpack the legacy of 'Animal Farm'

The University of Oxford's David Dwan—a professor of English literature and intellectual history—is an Orwell scholar who has written about the author's politics, especially as they relate to "Animal Farm." In this conversation with Dr. Nathan Waddell, from the University of Birmingham, UK, Dwan explores how framing the novella as a beast fable both made it more accessible and allowed it to be overly simplified.

Henry David Thoreau, the transcendentalist writer and philosopher, was inspired by the philosophical ideas of yoga.

Scientists can determine Earth's past environmental conditions by analyzing sediment cores—accumulated layers of mud and remains of charcoal, pollen, plants, algae, and other organic material.

Watch a visualization of how Earth's oceans impact its atmosphere, weather, and climate.

Microforests in urban environments may help combat climate change

Areas of densely packed native trees and drought-tolerant plants within cities can pull carbon dioxide from the air, cool surrounding neighborhoods, and support local wildlife. The idea behind microforests traces back over 50 years to Japanese ecologist Dr. Akira Miyawaki, who promoted planting whole ecosystems to restore degraded land.

Despite privacy risks, scientists are using DNA in the air to assess ecosystem health

While DNA in soil and water samples has long been used for such analyses, airborne DNA is being incorporated into such efforts to monitor individual species abundance, detect invasive species, measure biodiversity, and determine the success of conservation actions. Future work may include detecting attacks from biological weapons.

Biosphere 2 gradually transformed into a lab modeling environmental disasters

Built to establish a self-sustaining habitat, the privately funded facility was taken over by Columbia University in 1995. Closed-system experiments were halted in favor of investigations focused on the effects of climate change, which continued after B2 was donated to the University of Arizona in 2011.

Rapid environmental changes are exacerbating natural extinction processes

Human activities behind climate change, habitat destruction, pollution, and overhunting have resulted in extinction rates up to 1,000 times greater than normal, triggering massive biodiversity loss. This has led scientists to refer to the current geological age as the Anthropocene era, in which humans are the dominant force shaping nature.

View the 55 ECVs used to describe Earth's atmospheric conditions

Essential climate variables include physical, chemical, and biological variables that meaningfully contribute to Earth's climate and how it changes with time. Many of these variables influence one another through feedback mechanisms across Earth's atmosphere, hydrosphere, cryosphere, biosphere, and geosphere.

The man who championed the ‘case method’ for higher ed later found it insensitive

The "case method" style of education is core to most MBA programs across the country. Recent research posits that Wallace Donham’s (who is credited with establishing the method as a force at Harvard Business School in the 1920s) views on the method changed in later years.

Thoreau's 'Civil Disobedience' was largely a protest against the Mexican-American War

Henry David Thoreau refused to pay taxes that funded what he saw as an unjust war waged to expand slavery. His act of protest inspired his famous essay "Civil Disobedience," a foundational text for nonviolent resistance.

Browse Emily Dickinson's collection of plant life

The poet began collecting plant life as a teen and assembling a herbarium, a collection of dried and pressed plants. The original book is housed in Harvard's rare book collection, but you can view digital scans of every page through the university's digital library.

In 2025, UK scientists began studying climate data from a 1.5-million-year-old ice core

The Antarctica sample will be melted and analyzed in Cambridge to learn about prehistoric environmental conditions. Researchers hope the ice core reveals how Earth's glacial cycles shifted dramatically around 800,000 years ago.

Tracing the history of the philosophy of human extinction

Global catastrophe is at the center of much contemporary debate over climate, war, science, technology, and more, and our period is marked by a lurking sense everything we know—including the human species—could end overnight. It wasn't always...

How is climate change reshaping the Great Northern Wilderness?

This article focuses on how climate change is drastically altering Kluane National Park in Canada and nearby areas in Alaska. Glaciers are struggling: One large glacier is melting so fast that it has redirected a river's flow, a phenomenon that...

Understanding the 1.5 degree Celsius climate benchmark

As more parts of the world are facing extreme weather, from high temperatures to increased natural disasters, there is much debate about what can be done. MIT News explores and explains the 1.5-degree benchmark for limiting the effects of climate change. Read to understand where the planet stands in relation to this threshold and what can be done at the global, regional, and personal levels to “keep 1.5 alive.”

John Steinbeck's 'Sea of Cortez,' a travelogue through the Gulf of California, is still used by ecologists today.