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What Triggers Ice Ages? [from 1997]
NOVA ^ | Posted 01.01.97 | Kirk A. Maasch

Posted on 01/21/2015 2:42:25 PM PST by hlmencken3

During the past billion years, the Earth's climate has fluctuated between warm periods—sometimes even completely ice-free—and cold periods, when glaciers scour the continents. In this article, climate scientist Kirk Maasch offers perspective on these historic changes, including the likely causes of the last great ice age—which contrary to common knowledge, we are still in the midst of...

...The globally averaged surface temperature for the Earth is approximately 15 degrees Celsius, and this is due largely to the greenhouse effect. Solar radiation entering earth's atmosphere is predominantly short wave, while heat radiated from the Earth's surface is long wave. Water vapor, carbon dioxide, methane, and other trace gases in the Earth's atmosphere absorb this long wave radiation. Because the Earth does not allow this long wave radiation to leave, the solar energy is trapped and the net effect is to warm the Earth. If not for the presence of an atmosphere, the surface temperature on earth would be well below the freezing point of water...


TOPICS: Society; Weather
KEYWORDS: climate; globalwarming; pbs
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From 1997, before the science was settled. /s

NOTE: "We are still in the midst of" the last great ice age!

1 posted on 01/21/2015 2:42:25 PM PST by hlmencken3
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To: hlmencken3
What Triggers Ice Ages?

ManBearPig....I'm super ceral this time...


2 posted on 01/21/2015 2:47:19 PM PST by BCW (ARMIS EXPOSCERE PACEM)
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To: hlmencken3

For all the nonsense we have heard about Global Warming over the past decade, a plunge into an Ice Age would be catastrophic. Even a “Little” Ice Age would result in massive starvation and economic depression. We need all the man made global warming that we can get.


3 posted on 01/21/2015 2:56:00 PM PST by Opinionated Blowhard ("When the people find they can vote themselves money, that will herald the end of the republic.")
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To: hlmencken3

My van?


4 posted on 01/21/2015 2:59:59 PM PST by Tax-chick ("A war is not over until the enemy stops fighting." ~ Thomas Sowell)
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To: hlmencken3

It should be obvious to everyone that COLD starts ice ages.


5 posted on 01/21/2015 3:02:09 PM PST by mountainlion (Live well for those that did not make it back.)
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To: hlmencken3

Actually, it’s cow farts blocking the Sun!


6 posted on 01/21/2015 3:02:54 PM PST by SWAMPSNIPER (The Second Amendment, a Matter of Fact, Not A Matter of Opinion)
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To: hlmencken3
"What Triggers Ice Ages?"

After reading all the available material on the subject apparently the cause for GlobalWarmingCoolingClimateChange is:

1. Hummers.

2. Cow Flatulence.

3. And anything liberals don't like...

7 posted on 01/21/2015 3:03:24 PM PST by Mad Dawgg (If you're going to deny my 1st Amendment rights then I must proceed to the 2nd one...)
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To: hlmencken3

8 posted on 01/21/2015 3:11:58 PM PST by TigersEye (ISIS is the tip of the spear. The spear is Islam.)
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To: hlmencken3

Cold, cold weather


9 posted on 01/21/2015 3:16:26 PM PST by NativeSon ( Grease the floor with Crisco when I dance the Disco)
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To: TigersEye

10 posted on 01/21/2015 3:18:01 PM PST by TigersEye (ISIS is the tip of the spear. The spear is Islam.)
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To: BCW
LOLOL!!! just damn... glad i wasn't drinking anything at the time
11 posted on 01/21/2015 3:38:19 PM PST by Chode (Stand UP and Be Counted, or line up and be numbered - *DTOM* -w- NO Pity for the LAZY - 86-44)
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To: mountainlion

Perhaps we should back up and say, what starts “COLD” ... then ... :-) ...


12 posted on 01/21/2015 3:54:49 PM PST by Star Traveler (Remember to keep the Messiah of Israel in the One-World Government that we look forward to coming)
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To: Star Traveler

Perhaps we should back up and say, what starts “COLD” ... then ... :-) ...

That is easy, less heat


13 posted on 01/21/2015 3:57:01 PM PST by mountainlion (Live well for those that did not make it back.)
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To: hlmencken3

Supposedly when JP Morgan was asked what he thought the stock market would do his reply was “It will fluctuate, son”.

Same goes for climate/weather. This much we know.


14 posted on 01/21/2015 4:01:42 PM PST by 2 Kool 2 Be 4-Gotten
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To: mountainlion

And then what is the start of less heat?

You see ... we’re looking for causes here and not merely definitions. It’s the cause that is the key.


15 posted on 01/21/2015 4:07:59 PM PST by Star Traveler (Remember to keep the Messiah of Israel in the One-World Government that we look forward to coming)
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To: Star Traveler
The sun is 35% cooler so that is not the answer. Last time the antarctic had a warming episode it was the sensors on the satellites. The temperatures of the 1880s are changing which affects the averages.

I really think the problem is Al Gore and his need to make $100M in 8 years.

16 posted on 01/21/2015 4:16:47 PM PST by mountainlion (Live well for those that did not make it back.)
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To: mountainlion

Going to causes ... as I pointed out in my last post, and to get to the point ... I would say it’s the sunspot activity, which affects some particles from outer space, which then affect cloud cover ... and then also volcanic activity. Besides sunspot activity, there is a variance in the sun’s heat output, too (which would be a different matter from sunspot activity).

That’s naming three causes there ... :-) ...


17 posted on 01/21/2015 4:19:40 PM PST by Star Traveler (Remember to keep the Messiah of Israel in the One-World Government that we look forward to coming)
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To: Star Traveler

That’s naming three causes there ... :-) ...

You left out cosmic rays and half of the heat of earth comes form radioactive decay of the core.


18 posted on 01/21/2015 4:26:53 PM PST by mountainlion (Live well for those that did not make it back.)
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To: mountainlion

The particles from outer space were what I was talking about in terms of cosmic rays, which affect cloud cover, which is governed by sunspot activity.

I’m not sure how much the inner core heat relates to climate change, however.


19 posted on 01/21/2015 4:31:14 PM PST by Star Traveler (Remember to keep the Messiah of Israel in the One-World Government that we look forward to coming)
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To: Star Traveler

I’m not sure how much the inner core heat relates to climate change, however.

I see “climate change” as a money making scam and government control mechanism. I see the temperatures of the earth as Climate.


20 posted on 01/21/2015 4:41:17 PM PST by mountainlion (Live well for those that did not make it back.)
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