Posted on 04/18/2023 5:59:52 AM PDT by silent majority rising
Yes. Earth has experienced cold periods (informally referred to as “ice ages,” or "glacials") and warm periods (“interglacials”) on roughly 100,000-year cycles for at least the last 1 million years. The last of these ice age glaciations peaked* around 20,000 years ago. Over the course of these cycles, global average temperatures warmed or cooled anywhere from 3° to perhaps as much as 8° Celsius (5°-15° Fahrenheit). It was partly through their attempts to understand what caused and ended previous ice ages that climate scientists came to understand the dominant role that carbon dioxide plays in Earth’s climate system, and the role it is playing in current global warming.
Over at least the past million years, glacial and interglacial cycles have been triggered by variations in how much sunlight reaches the Northern Hemisphere in the summer, which are driven by small variations in the geometry of Earth’s axis and its orbit around the Sun. But these fluctuations in sunlight aren’t enough on their own to bring about full-blown ice ages and interglacials. They trigger several feedback loops that amplify the original warming or cooling. During an interglacial,
sea ice and snow retreat, reducing the amount of sunlight the Earth reflects; warming increases atmospheric water vapor, which is a powerful greenhouse gas; permafrost thaws and decomposes, releasing more methane and carbon dioxide; and the ocean warms and releases dissolved carbon dioxide, which traps even more heat. These feedbacks amplify the initial warming until the Earth’s orbit goes through a phase during which the amount of Northern Hemisphere summer sunlight is minimized. Then these feedbacks operate in reverse, reinforcing the cooling trend.
*Correction. An earlier draft mistakenly said that the last of these ice ages ended about 20 thousand years ago. The glaciation phase peaked around that time. The Grindlewald Fluctuation began in 1650 and ended in the early 20th century, and so ALL of our calculations reflect warming from that period.
NYC had a mile thick glacier over it 20,000 years ago.
You can still see the ground down glacier boulders in Central Park.
Where do they get the ancient ‘data’ from? Tree rings, ice cores?
Well, natural or not, it has. It changed overnight at our place. Snow and windchill of 14 deg this morning. Guess who DIDN’T CONtrol it?
All you have to do to see climate crap is crap is go outside ,LOL
“Hasn’t Earth warmed and cooled naturally throughout history?”
Wassamatta you? Tryin to mess up the narrative?
EVERYBODY knows, it’s the SUVs and the gas stoves.
QUIT IT OUT, right now! < /sarcasm >
bttt
f every country on Earth confiscated every penny beyond bare subsistence from every person alive and spent it all on “climate”, they could not affect the global temperature by one degree or the sea levels by an inch. If you believe otherwise, you have been scammed. The objects of the scam- MONEY and POWER.
If every human disappeared tomorrow, the Earth would continue in its slightly irregular orbit of the Sun, with its little wobble, as it has since God set it spinning. Winter, spring, summer and fall would progress as always. Natural cycles would continue; global temperatures would change periodically, glaciers would advance and retreat, ocean levels would rise and fall, deserts would become savannas and savannas would become forests or wetlands. Some forests and wetlands would revert to desert. Over eons of time tectonic forces would push up mountains and volcanoes would erupt, and over more eons they would be worn down by wind and rain.
This would continue until the day of the Lord’s choosing, when our Sun goes nova and reduces the planet to ash.
The main difference is that there would be no liberals around to lie about it.
In the mid 1970s COMING ICE AGE SCARE we were promised Chicago would be under a permanent layer of ice by now.
So where is it?
The only way to fight propaganda is to displace it with the truth. We have let the media control US for too long.
Puny humans, in their arrogance, actually think they can create/stop any process in the universe! Seriously???
THESE are the same people who are right NOW haggling over gender issues that have, themselves, continued unchanged for over 4 billion years. Sheeeesh!
Good post
Milankovich Cycles.
The Left can’t change, hide, or overrule them. They hate that.
NO! NOPE! Nominee!, it’s lies, all lies! man is the only one responsible for climate change. Our co2 takes up a whopping 0.0034% of the atmosphere, so obviously that “huge” amount creates a mile’s thick blanket traps all the heat on earth and won’t let any escape! /s
We don’t produce anywhere near the amount of co2 to blanket the globe and cause global climate change- not even close!
Climate alarmists are freaking out over a 400 parts per million co2 accumulation I. The atmosphere- calling it a “tipping point” and declaring life will cease. Life actuslly thrived under a more than 800 parts per million atmospheric co2 conditions in the past.
Since there were far more species kinds and subspecies back in the early days of high co2 over 800 ppm, and since we have far less species today under a 400-450 ppm atmospheric co2, I woild wager that the low 450 ppm is killing off species and propose we multip,y our co2 output more than 100 times in the slim hope that it Wil. Raise co2 levels so that species don’t die off as quick
Not from ice cores, because ice cores actually show that warming happens FIRST while co2 rises after 800 years of warming, which disproves their claim that co2 drives warming. So they ignore ice core samples, or try to falsely explain the gap away.
Also, many tree ring records fail to show any warming signs since the 50’s
Teee rings from very long growing trees are also unreliable for various reasons
Science is not the climate alarmists best friend. It refutes everything they claim
According to experts; they’re have been 5 major ice ages; 2 billion years ago and 3 million years ago......we are currently living in an ice age.....Climate changers have not done their homework and are blowing mostly smoke.
Lol- you just didn’t concentrate and beleive hard enough to control it
Sun Deniers
“NYC had a mile thick glacier over it 20,000 years ago.
You can still see the ground down glacier boulders in Central Park.”
Don’t we owe it to Mother Nature to restore the area to its natural state? Maybe we can start by tearing down all the structures and trucking in millions of pounds of ice. Think of all the jobs it would create?!
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.