25 years does not represent even 1 billionth of climate time on this earth.
Exactly. It's like I said a few weeks ago in another thread. Drawing conclusions based on the 150ish years of the temperature record is like measuring the changes in your heart rate over the past two seconds to conclude that you're about to have a heart attack.
Scientists know the climate we've had forever, and exactly for thousands of years, as you chose to ignore because I don't remember their exact methods lol.
No, scientists don't know those things. You don't know what information they have, or the validity of their hypotheses, or the soundness of their conclusions. Because
you don't even know what it is.
Ice cores have become one of the left's favorite talking points when it comes to the global warming discussion. They say that ice cores tell us the temperature of the Earth tens and hundreds of thousands of years ago. Sometimes, over a million years ago! But what you don't know is how ice cores are used. If you did, you'd be faced with how useless they are in the way they've been parroted.
This is how ice cores are used in climate science:
Drill out an ice core. Let's say it's 20 meters long. The ice core becomes a sort of tangible timeline. The top of the ice core represents the present, the bottom of the ice core represents the time when the the bottom ice formed, and everything in between represents the passage of time in between then and now. Thus, a given point (let's say 10 meters down) represents a certain period of time. The extrapolation of dates from ice cores does actually have a good degree of reliability.
A sample is taken from a given "moment in time" from the ice core. That sample is analyzed for composition. Most pertinently,
they look for the amount of CO2 dissolved in water which composes the ice from the sample. From this, they then extrapolate the approximate atmospheric concentration of CO2 at the point in history represented by that portion of the ice core. This is still reasonably possible, though there are important considerations that shroud the accuracy of this process, which tend to be ignored.
But where things really fall apart is the final step. Using this extrapolated atmospheric CO2 figure, they extrapolate the Earth's average temperature for that moment of history. This calculation is done using data from the 150 year temperature record and measurements of atmospheric CO2 in modern times,
based on the same hypothesized belief that atmospheric CO2 levels can be directly tied to average temperatures. When this process is finished, the results are presented
and are claimed to be evidence in support of the very premise that was used to achieve the results, i.e. that climactic changes are linked to changes in atmospheric CO2 levels.
The entire process is question begging.
You would get a failing grade for lack of adaquete research in any class I have ever taken for that analysis.
CSA - Discovery Guides
When ice cores are drilled they are 4-5 inches in diameter and cut in lengths of about 1 meter to be catalogued and stored for analysis. Some projects allow for the chemical analyses to be done at the drill site; however other projects require the cores to be shipped and stored in cold rooms.For scientists interested in reconstructing climatic histories, the chemical composition of the ice and dust contained in it allows for a wide variety of analytical techniques, as mentioned above. This is a valuable characteristic of ice as it allows scientists to study many proxy parameters, enabling data comparisons from other ice cores and other paleo-proxy sources within the same ice core. This can be extremely useful in helping to determine age/depth relationships of ice cores (ice core dating) and test for data quality. Dating paleo-records is arguably the most important aspect of paleoclimatic reconstructions, as time series that cannot be placed in time are essentially useless.
Analytic Techniques:
Ice cores can contain several forms of paleo-proxy data that estimate standard meteorological parameters to help reconstruct past climates. Some of the more common meteorological data that can be reflected in ice include air temperature, atmospheric circulation variations, precipitation amount, atmospheric composition, solar activity, and records of volcanic eruptions. These parameters can be represented by corresponding proxy records including stable isotopes, radioisotopes, dust composition, snow accumulation rate, air bubbles, and volcanic ash or sulfate.
Parameter
Proxy Analysis
Paleotemperatures
Summer
Annual cycles (Days with snowfall)
Melt Layers
dD, d18O
Humidity Deuterium excess
Paleo-accumulation Seasonal signals, 10Be
Volcanic activity Conductivity, SO4
Tropospheric turbidity ECM, microparticle content,
trace elements
Wind speed Particle size, concentration
Atmospheric composition: Natural
Variations and man-made changes CO2, CH4, N2O content,
glaciochemistry
Atmospheric circulation Glaciochemistry (major ions)
Solar activity 10Be
Ice Core Sources of Paleoclimatic Information
All of the modern analytical techniques used to extract these proxy records have been developed and honed over time, and with the assistance of better technology and new ideas more accurate methods of ice core analyses are being developed. Before scientists can begin reconstructing past climates from paleo-proxies derived from ice cores however, the ice must be drilled and analyzed.