How Long Will Human Impacts Last? (2024)

A guest post by David Biello
Science Curator, TED; Contributing Editor, Scientific American
New York, USA

Note from BHP Team: What you’ll read below is a transcript from the TED-Ed lesson “How Long Will Human Impacts Last,” developed by David Biello. For more, visit ed.ted.com. David will be hosting an Exchange in the BHP Online Teacher Community from June 4-6. Please join!

Imagine aliens land on the planet a million years from now and look into the geologic record. What will these curious searchers find of us?

They will find what geologists, scientists, and other experts are increasingly calling the Anthropocene, or new age of mankind. The impacts that we humans make have become so pervasive, profound, and permanent that some geologists argue we merit our own epoch. That would be a new unit in the geologic time scale that stretches back more than 4.5 billion years, or ever since the Earth took shape. Modern humans may be on par with the glaciers behind various ice ages or the asteroid that doomed most of the dinosaurs.

What is an epoch?
Most simply, it’s a unit of geologic time. There’s the Pleistocene, an icy epoch that saw the evolution of modern humans. Or there’s the Eocene, more than 34 million years ago, a hothouse time during which the continents drifted into their present configuration. Changes in climate and fossils found in the rock record help distinguish these epochs and help geologists tell deep time.

So, what will be the record of modern people’s impact on the planet?
It doesn’t rely on the things that may seem most obvious to us today, like sprawling cities. Even New York City or Shanghai may prove hard to find buried in the rocks a million years from now. But humans have put new things into the world that never existed on Earth before, like plutonium and plastics. In fact, the geologists known as stratigraphers, who determine the geologic timescale, have proposed a start date for the Anthropocene of around 1950. That’s when people started blowing up nuclear bombs all around the world and scattering novel chemical elements to the winds. Those elements will last in the rock record, even in our bones and teeth for millions of years. And in just 50 years, we’ve made enough plastic—at least 8 billion metric tons—to cover the whole world in a thin film.

People’s farming, fishing, and forestry will also show up as a before and after in any such strata because it’s those kinds of activities that are causing unique species of plants and animals to die out. This die-off started perhaps more than 40,000 years ago as humanity spread out of Africa and reached places like Australia, kicking off the disappearance of big, likable, edible animals. This is true of Europe and Asia (think woolly mammoth) as well as North and South America, too. For a species that has only roamed the planet for a few hundred thousand years, hom*o sapiens has had a big impact on the future fossil record. That also means that even if people were to disappear tomorrow, evolution would be driven by our choices to date.

We’re making a new, less-diverse world of certain favored plants and animals, like corn and rats. But it’s a world that’s not as resilient as the one it replaces. As the fossil record shows, it’s diversity of plants and animals that allows unique pairings of flora and fauna to respond to environmental challenges, and even thrive after an apocalypse. That goes for people, too. If the microscopic plants of the ocean suffer as a result of too much carbon dioxide, say, we’ll lose the source of as much as half of the oxygen we need to breathe. Then there’s the smudge in future rocks. People’s penchant for burning coal, oil, and natural gas has spread tiny bits of soot all over the planet. That smudge corresponds with a meteoric rise in the amount of carbon dioxide in the air, now beyond 400 parts per million, or higher than any other hom*o sapiens has ever breathed. Similar soot can still be found in ancient rocks from volcanic fires of 66 million years ago, a record of the cataclysm touched off by an asteroid at the end of the late Cretaceous epoch.

So, odds are our soot will still be here 66 million years from now, easy enough to find for any aliens who care to look. Of course, there’s an important difference between us and an asteroid. A space rock has no choice but to follow gravity. We can choose to do differently. And if we do, there might still be some kind of human civilization thousands or even millions of years from now. Not a bad record to hope for.

About the Author: David Biello is the author of The Unnatural World: The Race to Remake Civilization in Earth’s Newest Age. He is an award-winning journalist who has been reporting on the environment and energy since 1999. He is the Science Curator for TED as well as a contributing editor at Scientific American. He has also written for publications ranging from Aeon and Foreign Policy to The New York Times and The New Republic. Biello hosts the documentary series Beyond the Light Switch as well as The Ethanol Effect for PBS.

How Long Will Human Impacts Last? (2024)
Top Articles
Divine Vastu Tips to Bring Prosperity and Prestige with Purse Colors for 2014
Coffin Corner: Reaching Beyond the Limitations
Prosper TX Visitors Guide - Dallas Fort Worth Guide
Chris wragge hi-res stock photography and images - Alamy
What's Wrong with the Chevrolet Tahoe?
Large storage units
Cooktopcove Com
Dc Gas Login
Morgan And Nay Funeral Home Obituaries
Craigslist Blackshear Ga
Michael Shaara Books In Order - Books In Order
Dr Adj Redist Cadv Prin Amex Charge
Po Box 35691 Canton Oh
Nesz_R Tanjiro
Conan Exiles: Nahrung und Trinken finden und herstellen
Hennens Chattanooga Dress Code
Caledonia - a simple love song to Scotland
Sea To Dallas Google Flights
12 Top-Rated Things to Do in Muskegon, MI
Naval Academy Baseball Roster
Deshuesadero El Pulpo
Divide Fusion Stretch Hoodie Daunenjacke für Herren | oliv
Taylored Services Hardeeville Sc
Guinness World Record For Longest Imessage
Things to do in Pearl City: Honolulu, HI Travel Guide by 10Best
Barbie Showtimes Near Lucas Cinemas Albertville
Vlacs Maestro Login
King Soopers Cashiers Check
Frommer's Belgium, Holland and Luxembourg (Frommer's Complete Guides) - PDF Free Download
Tra.mypatients Folio
آدرس جدید بند موویز
Sadie Sink Doesn't Want You to Define Her Style, Thank You Very Much
Grapes And Hops Festival Jamestown Ny
Whitehall Preparatory And Fitness Academy Calendar
Game8 Silver Wolf
Final Fantasy 7 Remake Nexus
Discover Things To Do In Lubbock
Shell Gas Stations Prices
Pathfinder Wrath Of The Righteous Tiefling Traitor
Lady Nagant Funko Pop
Kjccc Sports
Sandra Sancc
The Complete Uber Eats Delivery Driver Guide:
Keci News
Jane Powell, MGM musical star of 'Seven Brides for Seven Brothers,' 'Royal Wedding,' dead at 92
Sapphire Pine Grove
March 2023 Wincalendar
Jasgotgass2
Bomgas Cams
The Love Life Of Kelsey Asbille: A Comprehensive Guide To Her Relationships
Latest Posts
Article information

Author: Trent Wehner

Last Updated:

Views: 6090

Rating: 4.6 / 5 (56 voted)

Reviews: 87% of readers found this page helpful

Author information

Name: Trent Wehner

Birthday: 1993-03-14

Address: 872 Kevin Squares, New Codyville, AK 01785-0416

Phone: +18698800304764

Job: Senior Farming Developer

Hobby: Paintball, Calligraphy, Hunting, Flying disc, Lapidary, Rafting, Inline skating

Introduction: My name is Trent Wehner, I am a talented, brainy, zealous, light, funny, gleaming, attractive person who loves writing and wants to share my knowledge and understanding with you.