Earth Is Hurtling Towards a Catastrophe Worse Than the Dinosaur Extinction
At several points in the history of our planet, increasing amounts of carbon dioxide in the atmosphere have caused extreme global warming, prompting the majority of species on Earth to die out.
In the past, these events were triggered by a huge volcanic eruption or asteroid impact. Now, Earth is heading for another mass extinction — and human activity is to blame.
I am an Earth and Paleo-climate scientist and have researched the relationships between asteroid impacts, volcanism, climate changes and mass extinctions of species.
My research suggests the current growth rate of carbon dioxide emissions is faster than those which triggered two previous mass extinctions, including the event that wiped out the dinosaurs.
The world's gaze may be focused on COVID-19 right now. But the risks to nature from human-made global warming — and the imperative to act — remain clear.
Past Mass Extinctions
Many species can adapt to slow, or even moderate, environmental changes. But Earth's history shows that extreme shifts in the climate can cause many species to become extinct.
For example, about 66 million years ago an asteroid hit Earth. The subsequent smashed rocks and widespread fires released massive amounts of carbon dioxide over about 10,000 years. Global temperatures soared, sea levels rose and oceans became acidic. About 80% of species, including the dinosaurs, were wiped out.
And about 55 million years ago, global temperatures spiked again, over 100,000 years or so. The cause of this event, known as the Paleocene-Eocene Thermal Maximum, is not entirely clear. One theory, known as the "methane burp" hypothesis, posits that a massive volcanic eruption triggered the sudden release of methane from ocean sediments, making oceans more acidic and killing off many species.
So is life on Earth now headed for the same fate?
Comparing Greenhouse Gas Levels
Before industrial times began at the end of the 18th century, carbon dioxide in the atmosphere sat at around 300 parts per million. This means that for every one million molecules of gas in the atmosphere, 300 were carbon dioxide.
In February this year, atmospheric carbon dioxide reached 414.1 parts per million. Total greenhouse gas level — carbon dioxide, methane and nitrous oxide combined — reached almost 500 parts per million of carbon dioxide-equivalent
Author provided / The Conversation /CC BY-ND
Carbon dioxide is now pouring into the atmosphere at a rate of two to three parts per million each year.
Using carbon records stored in fossils and organic matter, I have determined that current carbon emissions constitute an extreme event in the recorded history of Earth.
My research has demonstrated that annual carbon dioxide emissions are now faster than after both the asteroid impact that eradicated the dinosaurs (about 0.18 parts per million CO2 per year), and the thermal maximum 55 million years ago (about 0.11 parts per million CO2 per year).
An asteroid wiped out the dinosaurs 66 million years ago. Shutterstock
The Next Mass Extinction Has Begun
Current atmospheric concentrations of carbon dioxide are not yet at the levels seen 55 million and 65 million years ago. But the massive influx of carbon dioxide means the climate is changing faster than many plant and animal species can adapt.
A major United Nations report released last year warned around one million animal and plant species were threatened with extinction. Climate change was listed as one of five key drivers.
The report said the distributions of 47% of land-based flightless mammals, and almost 25% of threatened birds, may already have been negatively affected by climate change.
A diagram showing the weakening Arctic jet stream, and subsequent movements of warm and cold air. NASA
This allows north-moving warm air to cross the polar boundary, and cold fronts emanating from the poles to intrude south into Siberia, Europe and Canada.
A shift in climate zones is also causing the tropics to expand and migrate toward the poles, at a rate of about 56 to 111 kilometres per decade. The tracks of tropical and extra-tropical cyclones are likewise shifting toward the poles. Australia is highly vulnerable to this shift.
Uncharted Future Climate Territory
Research released in 2016 showed just what a massive impact humans are having on the planet. It said while the Earth might naturally have entered the next ice age in about 20,000 years' time, the heating produced by carbon dioxide would result in a period of super-tropical conditions, delaying the next ice age to about 50,000 years from now.
During this period, chaotic high-energy stormy conditions would prevail over much of the Earth. My research suggests humans are likely to survive best in sub-polar regions and sheltered mountain valleys, where cooler conditions would allow flora and fauna to persist.
Earth's next mass extinction is avoidable — if carbon dioxide emissions are dramatically curbed and we develop and deploy technologies to remove carbon dioxide from the atmosphere. But on the current trajectory, human activity threatens to make large parts of the Earth uninhabitable - a planetary tragedy of our own making.
Reposted with permission from The Conversation.
- Humans Are Wiping Out Species So Fast That Evolution Can't Keep ... ›
- UN Biodiversity Chief: Humans Risk Living in an 'Empty World' With ... ›
- Earth's Sixth Mass Extinction Already Underway - EcoWatch ›
- Modern Medical Techniques Reveal Malignant Cancer in 77-Million Year-Old Dinosaur Bone - EcoWatch ›
- Warming Tropical Soil Emits Unexpectedly Large Amounts of CO2, New Study Finds - EcoWatch ›
- Asteroid Could Strike Earth Before Election Day, But Won’t Cause Major Damage, NASA Says - EcoWatch ›
- Climate Change Likely Drove Our Ancestors to Extinction, Study Finds - EcoWatch ›
By Julia Conley
A federal judge in Washington, D.C. late Sunday struck down the Trump administration's proposed changes to the SNAP benefits program, potentially saving hundreds of thousands of people from losing badly needed federal food assistance.
<div id="e8d44" class="rm-shortcode" data-rm-shortcode-id="be49aabc36a5465eed30ca54f88f6b2d"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1318171686232096772" data-partner="rebelmouse"><div style="margin:1em 0">A judge has ruled in our favor and blocked the Trump administration’s unlawful changes to SNAP. This decision is… https://t.co/5zeTafxMLm</div> — NY AG James (@NY AG James)<a href="https://twitter.com/NewYorkStateAG/statuses/1318171686232096772">1603111595.0</a></blockquote></div>
<div id="f47ab" class="rm-shortcode" data-rm-shortcode-id="381daa45528adda7398d5628d047294f"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1318175677724676096" data-partner="rebelmouse"><div style="margin:1em 0">There's a lot of competition for Vilest Policy Ever, but slashing food stamps during a pandemic that's causing mass… https://t.co/EYvb0C8Q3m</div> — Tamar Haspel (@Tamar Haspel)<a href="https://twitter.com/TamarHaspel/statuses/1318175677724676096">1603112546.0</a></blockquote></div>
<div id="946d8" class="rm-shortcode" data-rm-shortcode-id="3cff2dc2643fc55ab21d2a73881c7de8"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1318168614541950976" data-partner="rebelmouse"><div style="margin:1em 0">Trump: yes to Space Force, no to Food Stamps. Another equation that might be remembered in a few weeks. https://t.co/9IEDBaMy2o</div> — Matt Taibbi (@Matt Taibbi)<a href="https://twitter.com/mtaibbi/statuses/1318168614541950976">1603110862.0</a></blockquote></div><p>"Trump: yes to Space Force, no to Food Stamps," Taibbi tweeted.</p>
- Trump Wants to Replace Food Stamps With Food Packages ... ›
- Trump Complains Puerto Rico Getting 'Too Much' Disaster Aid as ... ›
- Trump USDA Resumes Effort to Cut Food Stamp Benefits - EcoWatch ›
EcoWatch Daily Newsletter
By Andrea Germanos
A group of Indigenous women and their allies on Monday urged the heads of major global financial institutions to stop propping up the tar sands industry and sever all ties with the sector's "climate-wrecking pipelines, as well as the massively destructive extraction projects that feed them."
- Global Banks, Led by JPMorgan Chase, Invested $1.9 Trillion in ... ›
- Keystone XL Pipeline Construction to Forge Ahead During ... ›
Poor eating habits, lack of exercise, genetics, and a bunch of other things are known to be behind excessive weight gain. But, did you know that how much sleep you get each night can also determine how much weight you gain or lose?
In January of 2019, a concerned citizen in Marion County, Florida noticed something strange: Someone was trapping flying squirrels.
The process of preparing and mixing a baby bottle formula seems innocuous, but new research finds this common occurrence is actually releasing millions of microplastic particles from the bottle's lining, Wired reported.
- Microplastics Found in Human Organs for First Time - EcoWatch ›
- Microplastics Are Raining Down on Cities - EcoWatch ›
- People Eat 50,000+ Microplastics Every Year, New Study Finds ... ›