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Mapped: What Did the World Look Like in the Last Ice Age?

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A map of the Earth 20,000 years ago, at the peak of the last ice age, when colder temperatures transformed the planet 
we know so well.

What Did the World Look Like in the Last Ice Age?

What did the world look like during the last ice age? Was it all endless glaciers and frozen ice? The answer is a partial yes—with some interesting caveats.

The Last Glacial Maximum (LGM), colloquially called the last ice age, was a period in Earth’s history that occurred roughly 26,000 to 19,000 years ago.

This map by cartographer Perrin Remonté offers a snapshot of the Earth from that time, using data of past sea levels and glaciers from research published in 2009, 2014, and 2021, alongside modern-day topographical data.

Let’s dive into the differences between the two Earths below.

The Last Ice Age: Low Seas, Exposed Landmasses

During an ice age, sea levels fall as ocean water that evaporates is stored on land on a large scale (ice sheets, ice caps, glaciers) instead of returning to the ocean.

Earth's Ice Cover20,000 Years AgoToday
Surface8%3%
Land25%11%

At the time of the LGM, the climate was cold and dry with temperatures that were 6 °C (11 °F) lower on average. Water levels in the ocean were more than 400 feet below what they are now, exposing large areas of the continental shelf.

In the map above, these areas are represented as the gray, dry land most noticeable in a few big patches in Southeast Asia and between Russia and Alaska. Here are a few examples of regions of dry land from 20,000 years ago that are now under water:

  • A “lost continent” called Sundaland, a southeastern extension of Asia which forms the island regions of Indonesia today. Some scholars see a connection with this location and the mythical site of Atlantis, though there are many other theories.
  • The Bering land bridge, now a strait, connecting Asia and North America. It is central to the theory explaining how ancient humans crossed between the two continents.
  • Another land bridge connected the island of Great Britain with the rest of continental Europe. The island of Ireland is in turn connected to Great Britain by a giant ice sheet.
  • In Japan, the low water level made the Sea of Japan a lake, and a land bridge connected the region to the Asian mainland. The Yellow Sea—famous as a modern-day fishing location—was completely dry.

The cold temperatures also caused the polar parts of continents to be covered by massive ice sheets, with glaciers forming in mountainous areas.

Flora and Fauna in the Last Ice Age

The dry climate during the last ice age brought about the expansion of deserts and the disappearance of rivers, but some areas saw increased precipitation from falling temperatures.

Most of Canada and Northern Europe was covered with large ice sheets. The U.S. was a mix of ice sheets, alpine deserts, snow forests, semi-arid scrubland and temperate grasslands. Areas that are deserts today—like the Mojave—were filled with lakes. The Great Salt Lake in Utah is a remnant from this time.

Africa had a mix of grasslands in its southern half and deserts in the north—the Sahara Desert existed then as well—and Asia was a mix of tropical deserts in the west, alpine deserts in China, and grasslands in the Indian subcontinent.

Several large animals like the woolly mammoth, the mastodon, the giant beaver, and the saber-toothed tiger roamed the world in extremely harsh conditions, but sadly all are extinct today.

However, not all megafauna from the LGM disappeared forever; many species are still alive, including the Bactrian camel, the tapir, the musk ox, and the white rhinoceros—though the latter is now an endangered species.

Will There Be Another Ice Age?

In a technical sense, we’re still in an “ice age” called the Quaternary Glaciation, which began about 2.6 million years ago. That’s because a permanent ice sheet has existed for the entire time, the Antarctic, which makes geologists call this entire period an ice age.

We are currently in a relatively warmer part of that ice age, described as an interglacial period, which began 11,700 years ago. This geological epoch is known as the Holocene.

Over billions of years, the Earth has experienced numerous glacial and interglacial periods and has had five major ice ages:

Major Ice AgesNameTime Period (Years Ago)
1Huronian Glaciation2.4 billion - 2.1 billion
2Cryogenian Glaciation720 million - 635 million
3Andean-Saharan Glaciation450 million - 420 million
4Late Paleozoic ice age335 million - 260 million
5Quaternary Glaciation2.6 million - present

It is predicted that temperatures will fall again in a few thousand years, leading to expansion of ice sheets. However there are a dizzying array of factors that are still not understood well enough to say comprehensively what causes (or ends) ice ages.

A popular explanation says the degree of the Earth’s axial tilt, its wobble, and its orbital shape, are the main factors heralding the start and end of this phenomenon.

The variations in all three lead to a change in how much prolonged sunlight parts of the world receive, which in turn can cause the creation or melting of ice sheets. But these take thousands of years to coincide and cause a significant change in climate.

Furthermore, current industrial activities have warmed the climate considerably and may in fact delay the next ice age by 50,000-100,000 years.

Still on a history kick? Check out Mapped: The Ancient Seven Wonders of the World that captivated people for thousands of years.
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This article was published as a part of Visual Capitalist's Creator Program, which features data-driven visuals from some of our favorite Creators around the world.

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United States

Mapped: How Much Does it Take to be the Top 1% in Each U.S. State?

An annual income anywhere between $360,000-$950,000 can grant entry into the top 1%—depending on where you live in America.

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A cropped map of the U.S. listing the annual income needed to be in the top 1% in each state.

How Much Does it Take to be the Top 1% in Each U.S. State?

There’s an old saying: everyone thinks that they’re middle-class.

But how many people think, or know, that they really belong to the top 1% in the country?

Data from personal finance advisory services company, SmartAsset, reveals the annual income threshold at which a household can be considered part of the top 1% in their state.

Some states demand a much higher yearly earnings from their residents to be a part of the rarefied league, but which ones are they, and how much does one need to earn to make it to the very top echelon of income?

Ranking U.S. States By Income to Be in the Top 1%

At the top of the list, a household in Connecticut needs to earn nearly $953,000 annually to be part of the one-percenters. This is the highest minimum threshold across the country.

In the same region, Massachusetts requires a minimum annual earnings of $903,401 from its top 1% residents.

Here’s the list of all 50 U.S. states along with the annual income needed to be in the 1%.

RankStateTop 1% Income
Threshold
Top 1% Tax Rate
(% of annual income)
1Connecticut$952,90228.40%
2Massachusetts$903,40127.15%
3California$844,26626.95%
4New Jersey$817,34628.01%
5Washington$804,85325.99%
6New York$776,66228.29%
7Colorado$709,09225.86%
8Florida$694,98725.82%
9Illinois$660,81026.35%
10New Hampshire$659,03726.25%
11Wyoming$656,11824.79%
12Virginia$643,84826.11%
N/ANational Average$652,657N/A
13Maryland$633,33325.94%
14Texas$631,84925.83%
15Utah$630,54423.77%
16Minnesota$626,45125.53%
17Nevada$603,75125.19%
18South Dakota$590,37322.99%
19Pennsylvania$588,70224.95%
20North Dakota$585,55624.76%
21Georgia$585,39725.06%
22Oregon$571,81324.66%
23Arizona$564,03125.22%
24Idaho$560,04023.17%
25North Carolina$559,76225.31%
26Montana$559,65624.46%
27Kansas$554,91225.03%
28Rhode Island$548,53125.26%
29Tennessee$548,32925.12%
30Alaska$542,82425.38%
31Nebraska$535,65124.10%
32Delaware$529,92825.37%
33Vermont$518,03923.63%
34Wisconsin$517,32124.90%
35South Carolina$508,42724.40%
36Michigan$504,67125.01%
37Maine$502,60524.04%
38Missouri$500,62624.93%
39Ohio$500,25325.09%
40Hawaii$495,26324.12%
41Iowa$483,98524.09%
42Indiana$473,68524.55%
43Alabama$470,34123.82%
44Oklahoma$460,17223.68%
45Louisiana$458,26924.80%
46Arkansas$450,70021.11%
47Kentucky$445,29424.14%
48New Mexico$411,39523.35%
49Mississippi$381,91923.04%
50West Virginia$367,58223.26%
N/ANational Median
Household Income
$75,000N/A

California ($844,266), New Jersey ($817,346), and Washington ($804,853) round out the top five states with the highest minimum thresholds to make it to their exclusive rich club.

On the other end of the spectrum, the top one-percenters in West Virginia make a minimum of $367,582 a year, the lowest of all the states, and about one-third of the threshold in Connecticut. And just down southwest of the Mountain State, Mississippi’s one-percenters need to make at least $381,919 a year to qualify for the 1%.

A quick glance at the map above also reveals some regional insights.

The Northeast and West Coast, with their large urban and economic hubs, have higher income entry requirements for the top 1% than states in the American South.

This also correlates to the median income by state, a measure showing Massachusetts households make nearly $90,000 a year, compared to Mississippians who take home $49,000 annually.

How Much Do the Top 1% Pay in Taxes?

Meanwhile, if one does make it to the top 1% in states like Connecticut and Massachusetts, expect to pay more in taxes than other states, according to SmartAsset’s analysis.

A chart showing how states with the top highest and lowest average tax rates for their top 1% residents.

The one-percenters in the top five states pay, on average, between 26–28% of their income in tax, compared to those in the bottom five who pay between 21–23%.

And this pattern exists through the dataset, with higher top 1% income thresholds correlating with higher average tax rates for the wealthy.

State RanksMedian Tax Rate
Top 1026.65%
20-3025.09%
30-4024.65%
10-2025.07%
40-5023.75%

These higher tax rates point to attempts to reign in the increasing wealth disparity in the nation where the top 1% hold more than one-third of the country’s wealth, up from 27% in 1989.

Where Does This Data Come From?

Source: SmartAsset’s America’s Top 1% Is Different in Each State uses data from 2020 individual tax filings from the IRS, adjusted to 2023 dollars using the Bureau of Labor Statistics’ Consumer Price Index.

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