This reinforces the point that the presenter in your video was just blowing smoke when he claimed that CO2 was necessary to explain the ice ages, or that it acted as a feedback to
those ice age changes.
The Ice Age changes were smaller and not forced by CO2 as we know from Milankovitch, so the CO2 was a response.
We have measured
those ice age changes, we have not measured such catastrophic changes as have been hypothesized for our emissions of CO2.
I'm not sure there's anything particularly new here, except a focus on Hansen's point that the «long term» timescale people talk about with climate may be a lot shorter than the several thousand years or so that was observed for
the ice age changes.
The Past and Future Ocean Circulation from a Contemporary Perspective, in AGU Monograph, 173, A. Schmittner, J. Chiang and S. Hemming, Eds., 53 - 74, (pdf)» Wunsch's publications page is great food - for - thought, I particularly enjoyed his papers on
Ice Age changes and the Milankovitch cycles.
Not exact matches
In this one lunch alone, we covered electric cars, climate
change, artificial intelligence, the Fermi Paradox, consciousness, reusable rockets, colonizing Mars, creating an atmosphere on Mars, voting on Mars, genetic programming, his kids, population decline, physics vs. engineering, Edison vs. Tesla, solar power, a carbon tax, the definition of a company, warping spacetime and how this isn't actually something you can do, nanobots in your bloodstream and how this isn't actually something you can do, Galileo, Shakespeare, the American forefathers, Henry Ford, Isaac Newton, satellites, and
ice ages.
They note past
ages that have been equally warm or warmer without human influence, to say nothing of repeating patterns of climate
change like
ice ages (though I've met one of James Hansen's computer modelers who told me with sincere conviction that there would not be another
ice age).
Frankly, if I wanted to worry about climate
change, I would worry about global cooling again, since the sun is behaving very weakly just now, and sun - watching scientists have even dared to suggest that a reprise of the Little
Ice Age is in the offing.
Colin... Your statement of «when
ice ages cause dramatic
changes in sea levels» is speculation of a possibility, not a scientifically accepted specific hypothesis.
One is
changed environmental conditions for a discrete subpopulation of the original population, such as when
ice ages cause dramatic
changes in sea levels, cutting species into subgroups.
Scientific study of the
Ice Age Floods is contributing to the understanding of cyclical climate
change and of very large and destructive contemporary floods on Earth.
1) What makes universe crafting all - powerful all - knowing
ice decide to melt (the
age old, how is this not «God»
changing his mind that never gets answered) 2) You speak of it like the
ice goes away, and the water takes over.
Astronomical factors also play a role in relation to the great
changes like the shift between
ice ages, which typically lasts about 100,000 years and interglacial periods, which typically last about 10 - 12,000 years.
Either the end of the Little
Ice Age or the Industrial Revolution has
changed the type of nitrogen incorporated into deep - water corals
Lost
ice due to climate
change and left - over momentum from the end of the last big
ice age mean the buoyant continent is heaven - bound.
Anthropogenic climate
change and resulting sea level rise are now happening much more rapidly than at the transition from the last
ice age to the modern global climate.
«It seems that the sun's quiescence was responsible for the most extreme phases of the Little
Ice Age, implying that solar variability sometimes plays a significant role in climate
change.
This
change in ocean chemistry followed a large - scale
ice age known as the Gaskiers glaciation.
A new study focusing on the birds of the
Ice Age has shed light on the long term response of birds to climate
change.
A
change in solar activity may also, for example, have contributed to the post Little
Ice Age rise in global temperatures in the first half of the 20th Century.
But during the Little
Ice Age, a period from roughly 1400 to 1850 when temperatures in Europe were cooler and many of Earth's glaciers expanded, the biggest
changes came from the Intertropical Convergence Zone shifting to the south.
Professor Gavin Foster, from the University of Southampton, said: «The Intergovernmental Panel on Climate
Change have shown that climate models can successfully simulate climates from the freezing world of the last
Ice Age, to the intense warmth of the «Eocene greenhouse», 50 million years ago.
A team of UK researchers has shed new light on the climate of the Little
Ice Age, and rekindled debate over the role of the sun in climate
change.
Grasses and shrubs began to take the place of the forbs — a
change in the landscape that coincided with the decline of the iconic
ice -
age megafauna.
«Now that we know how these factors
changed from the
ice age to today,» Marcott says, «we thought, if we really want to put the future in perspective, we can't look out just 300 years.
To get to the bottom of things, he mapped the
ages and locations of 1,323 woolly mammoth remains and 576 archaeological sites, and he merged them with data from plant and pollen records, and climate
change information from
ice cores in Greenland.
The discovery of
ice ages in the distant past proved that climate could
change radically over the entire globe, which seemed vastly beyond anything mere humans could provoke.
An international team of scientists has discovered new relationships between deep - sea temperature and
ice - volume
changes to provide crucial new information about how the
ice ages came about.
This is due to the thaw following the last
ice age: the melting of glaciers lets the crust rebound, redistributing Earth's mass and leading to subtle
changes in its axis of rotation.
In that sense, the observed decoupling of temperature and
ice - volume
changes provides crucial new information for our understanding of how the
ice ages developed.
Was it humankind or climate
change that caused the extinction of a considerable number of large mammals about the time of the last
Ice Age?
The sun and moon tug on the planet, while the drift of continents,
changes in ocean currents, and the rebounding of the crust since the retreat of
ice age glaciers all shift mass around, altering Earth's moment of inertia and therefore its spin.
So if you think of going in [a] warming direction of 2 degrees C compared to a cooling direction of 5 degrees C, one can say that we might be
changing the Earth, you know, like 40 percent of the kind of
change that went on between the
Ice Age; and now are going back in time and so a 2 - degree
change, which is about 4 degrees F on a global average, is going to be very significant in terms of
change in the distribution of vegetation,
change in the kind of climate zones in certain areas, wind patterns can
change, so where rainfall happens is going to shift.
This is of great concern to ecologists because the populations in these areas include pockets with the highest levels of genetic diversity, thanks to their ancestors having survived major climate
change events such as
ice ages.
Mammoths» Last Stand St. Paul's landscape of treeless tundra has likely
changed little since the end of the last
ice age, some 12,000 years ago.
For example, the
ice ages during the last several million years — and the warmer periods in between — appear to have been triggered by no more than a different seasonal and latitudinal distribution of the solar energy absorbed by the Earth, not by a
change in output from the sun.
«The end of an
ice age, you have a sense in your bones what that means: a big, significant
change for the planet,» Shakun says.
Other fossil evidence dating back to the
ice -
age origins of some of the lakes shows the
changes of the last century - and - a-half are unprecedented, he adds.
Currently, the shifts between
ice ages and warm interglacial phases are thought to be influenced by three cyclical
changes to Earth's motion.
This drift is due to the
changes in the distribution of Earth's mass as the crust slowly rebounds after the end of the last
ice age.
«It would produce a climate
change unknown in recorded history — colder than the little
ice age,» Robock says, referring to the period between the 14th and 19th centuries when a 1.5 °F drop below today's temperatures caused crop failures, famines, and political unrest in northern Europe.
A McGill - led international research team has now completed the first global study of
changes that occurred in a crucial component of ocean chemistry, the nitrogen cycle, at the end of the last
ice age.
«Detailed chemical measurements in Antarctic
ice cores show that massive, halogen - rich eruptions from the West Antarctic Mt. Takahe volcano coincided exactly with the onset of the most rapid, widespread climate
change in the Southern Hemisphere during the end of the last
ice age and the start of increasing global greenhouse gas concentrations,» according to McConnell, who leads DRI's ultra-trace chemical
ice core analytical laboratory.
«
Ice age vertebrates had mixed responses to climate
change: New study contradicts idea of uniform population
change, has significance for understanding global warming impact.»
«
Ice - ages may superficially look similar to one another, but there are important differences in the relationships between the melting of continental ice sheets and global climate chang
Ice -
ages may superficially look similar to one another, but there are important differences in the relationships between the melting of continental
ice sheets and global climate chang
ice sheets and global climate
changes.
«We have now added a view of the climate
changes at the end of another
ice age, for comparison, and we found that the patterns were different,» said co-author Professor Eelco Rohling, from the University of Southampton and ANU.
The ends of
ice ages were different, but we can still use them to learn more about the sensitivity of the massive Antarctic
ice sheet to climate
change.»
At the end of an
ice age continental
ice sheets, oceans and atmosphere
change rapidly.
Moreover, a jump in the region's erosion rates about a million years ago coincides with a transition to more powerful
ice ages — a sign that climate
change can have a larger than expected effect in tearing down mountains.
Guliya is thought to be the best record of midlatitude climate during the last
ice age, and its
ice may well turn out to be a Rosetta Stone for interpreting how Asia responds to a
changing climate.