What caused the Ice Ages and other important climate changes before the industrial era?

Question

i need a website and any other information its for a science project on global warming

Answer 1

Natural phenomena.  Start with Mt. St. Helens spewing more garbage into the atmosphere than the entire industrial age combined.

However, for your science project, you might want to consider global cooling.

Solar scientists predict that, by 2020, the sun will be starting into its weakest solar cycle of the past two centuries. They say this will likely lead to unusually cool conditions on Earth. It is also predicted that this cool period will go much longer than the normal 11 year cycle, as the Little Ice Age did. The climate threat is actually cooling, especially to countries like Canada. On the northern limit to agriculture in the world, very little cooling would likely destroy much of its food crops.

The Little Ice Age—the coldest period in the past 1500 years—corresponded perfectly with the Maunder Minimum. There was virtually no sunspot activity for almost seven decades in the Maunder Minimum(per Willie Soon/ Harvard/Astrophysics). It turns out that for those 60-70 years the northern half of our globe was in a deep freeze. The New York harbor froze, allowing walkers to journey from Manhattan to Staten Island, and the Vikings abandoned Greenland--a once verdant land that became tundra. In that Little Ice Age, Finland lost 1/3 of its population and Iceland 1/2.

In the well-known 11-year “Schwabe” sunspot cycle, the output of the sun varies by about 0.1%. Sunspots are violent storms on the surface of the sun. Marine productivity and total irradiance match very well with records that have been kept for centuries on visible sunspots. Hundreds of studies of sunspots and earthly climate indicators(tree rings in Russia’s Kola Peninsula, to water levels of the Nile) show exactly the same thing—that the sun drives climate change.

Even though it has been discovered that the sun is brighter now than anytime in the past 8000 years, the increase in solar output was not calculated to be sufficient to cause all of the past century’s modest warming. But that amplifier was discovered(starting in 2002) with scientific papers from Veizer, Shaviv, Carslaw, and most recently Svendsmark(Danish National Space Agency).

All these scientists have proven(particularly w/Svendsmark) that the sun’s protective solar wind(from sunspots) blows away deep-space cosmic rays. With fewer sunspots there is less solar wind, more cosmic rays, and more cloud formation from those cosmic rays. More cloud formation means more cooling effect on the planet.

In a 2003 poll, 2/3 of more than 530 climate scientists from 27 countries did not believe greenhouse gases were the main reason for global warming. In fact, overlays of CO2 variations show little correlation with earth’s climate on long, medium, and even short time scales. The science is nowhere near settled.

Nigel Weiss(Mathematical Astrophysics/Cambridge) states that “Variable behavior of the sun is an obvious explanation.” He admits that we are now living in a period of abnormally high solar activity, and that these hyperactive periods do not last long(50-100 years), then you get a crash. “It’s a boom-bust system, and I would expect a crash soon.” And when the crash occurs, the Earth can cool dramatically.

Dr. Kukla(Czechoslovakian Academy of Sciences) say he and many others realize that global warming always precedes an ice age. Each lasts about 100,000 years, punctuated by briefer, warmer periods called interglacials.  We are in an interglacial now. This ongoing cycle closely matches cyclic variations in Earth’s orbit around the sun. Kukla says “The relationship is just too clear and consistent to allow reasonable doubt. It’s either that, or climate drives orbit, and that just doesn’t make sense.”

No one knows when a ‘crash’ will occur, but scientists expect it soon. Mainly because the sun’s polar field is now at its weakest since measurements began in the 1950’s.  A deep crash last occurred in the 17th century—and it was the Little Ice Age, or the Maunder Minimum. “Having a ‘crash’ would certainly allow us to pin down the sun’s true level of influence on the earth’s climate,” concludes Dr. Weiss. “Then we will be able to act on fact, rather than from fear.”

It’s not likely greenhouse ‘gassers’ will be converted in 12 years. They’ll be busy looking for something humans have done to make it so cold.

(But if you do consider bringing real science into it, expect to be heckled for "not caring about the environment."

Answer 2

Try this site

http://en.wikipedia.org/wiki/Milankovitc...

It is open source and does a great job explaining the cycles.  It also has links to other references and copyrighted sources if you need them.  Take a look.

It you look at the graphics, you'll see that we are now at a high-point (warm period) at the end of a glacial period.  This is what a lot of people want to say this the only cause of climate change.  However, there is more to it.   Read the text and some of the links you'll see the speed at which the climate is warming is not in line with the speed expected from only natural variation.  Yes, natural variation plays a part (as scientist have known and considered), but the increased rate of warming is primarily due to human activity.

Answer 3

The prevailing theory for Ice Age changes is varying solar radiation due to "Milankovic cycles".  

http://earthguide.ucsd.edu/virtualmuseum...

Google it for many more websites.

How do we know that's not happening now?  Pretty simple, we measure the Sun.

"Recent oppositely directed trends in solar

climate forcings and the global mean surface

air temperature", Lockwood and Frolich (2007), Proc. R. Soc. A

doi:10.1098/rspa.2007.1880

http://www.pubs.royalsoc.ac.uk/media/pro...

News article at:

http://news.bbc.co.uk/1/hi/uk/6290228.st...

Answer 4

We don't know for sure and we may never know. All information we have is merely speculation and theory.

Answer 5

Nature caused ALL the Ice Ages as well as ALL the periods of global warming that preceded and followed them.  There is no legitimate reason to believe that anything other than nature is causing the current weather issues today.

Answer 6

The milankovitch cycle and the continents migrating to the poles is the most important reasons.  Other reasons are the Isthmus of Panama forming changing currents, the subcontinent of India smashing into Asia, the formation of the Indonesian Archipelago, etc.  

People seem to have an innate desire for their lives to have consequences.  The left seems to believe beyond reason that humans must be impacting the environment and the impact must be negative.  They refuse to look at  potential benefits obviously due to their political orientation and willingness to go along with the crowd, in my opinion.

Answer 7

Gore lied to U and it is making big money for sum. For U to propagate this is making it hard for the poor.