Uniformitarianism

{{philosophyscience}}{{cw}}
{{Sources needed}}
{{cquote|There shall come in the last days scoffers, walking after their own lusts, and saying, Where is the promise of his coming? for since the fathers fell asleep, all things continue as they were from the beginning of the creation.|||[[Biblical prophecy]], foreshadowing the advent and motivation of Uniformitarianists in {{bible|2 Peter|3|3|4}}}}
'''Uniformitarianism''' is a principle in [[science]] and in the [[philosophy of science]]. Essentially, uniformitarianism spells out the assumption that [[natural law]] has always operated as it operates at present. Although an assumption, it is considered a very good and reasonable assumption, and certainly produces theories which are self-consistent, plausible, and which explain observed evidence well. However, its successes are often ignored, as it leads to conclusions that [[Biblical literalism|certain]] [[Creationism|groups]] dislike, and these groups sometimes go to some lengths to discredit uniformitarianism as a useful tool in the study of the natural world.

The principle of uniformitarianism makes the [[methodological naturalism]] of modern science much more useful. It allows scientists, such as [[geologist]]s, to study the past without actually having been there to directly observe it unfolding.

==History==
The principle of uniformitarianism was first formulated by Charles Lyell in his seminal work, ''Principles of Geology'' published in 1830. This was built on the insight of "[[deep time]]" propounded by James Hutton to explain geological processes. However, the term 'uniformitarianism' was not coined by Lyell, but by the Cambridge academic William Whewell, who called Lyell a ''uniformitarian'' in contrast to his own ''[[catastrophism]]'' — catastrophism, of course, being a euphemism for the [[Global flood|Biblical flood]]. The ensuing arguments between deep-time scientists and [[Biblical literalist]]s brought the term catastrophism into disrepute. For a long time, the idea of uniformity of physical processes and uniformity of geological processes and their rate of action was the accepted model for uniformitarianism; however, as more geological evidence was accrued, it became obvious that there have been both major and minor catastrophic occurrences in the Earth's history which have left their mark in both the geological and [[biological]] records. These have been entirely natural, albeit rare, events which neither upset the principle of uniformity of physical processes nor support the Biblical account of a global flood.

==Why it's smart==
[[Creationists]] often assert that real scientists have no justification for assuming that [[physics|physical]] laws are constant over time, and therefore, any work which is based upon this assumption (such as [[radiometric dating]]) is invalid. In reality, this Creationist assertion is not just wrong twice over, but if it ''were'' valid, it would necessarily render ''all'' [[science]] (including the Creationist version) and learning a perfect and utter waste of time.

First, real scientists don't actually presume that physical laws are constant; rather, they presume that ''if'' physical laws really did change, that change would leave traces of itself which could be detected by an appropriate [[experiment]] or [[observation]]. As such, real scientists can and do look for evidence that physical laws have changed. Empirical observations have, in fact, established that the greatest possible change which ''could have'' occured in physical laws is on the order of 1 part in several billion over the gigayears-long lifetime of the Universe.{{cn}}

Second, if physical laws ''do'' change in an indetectable manner, how can you trust that ''anything'' is reliable? Perhaps [[gravity]] might become a repulsive force tomorrow morning. Perhaps the molecules of your [[Bible]] might have rearranged themselves, transforming it into a copy of ''[[The God Delusion]]'' when you weren't looking. Simply put, uniformitarianism is the [[Occam's Razor|simpler]] assumption &mdash; because assuming that everything can change as it pleases, without any evidence of these variations, is unnecessary and need not be believed to explain ''everything'' we know.

The history of the attitude of the [[Judeo-Christian]] [[Yahweh]] towards His human likenesses<ref>{{bible|Genesis|1|27}} &mdash; "God created man in his own image, in the image of God created he him […]".</ref> provides a good example of uniformitarianism in action &mdash; the [[omnibenevolent|loving]] [[God]] remains the same yesterday, today and forever ({{bible|Hebrews|13|8}}). ([[Problem of evil|Intermittent hissy-fits]] like [[The Fall|expelling]] humankind from [[Garden of Eden|Eden]], [[Global flood|drowning almost all of humanity]], sanctioning [[Genocide|the complete slaughter]] of the enemies of Israel, and switching the outpouring of [[Grace]] from [[Jews|Jewry]] to the [[Goyim|Gentile]] [[Christians]] merely represent occasional bouts of catastrophism within the overarching context of the overall uniformitarian Divine Plan.)

==Criticism of uniformitarianism==
===By young-Earth creationists===

Uniformitarianism has come under much criticism from [[Young earth creationism|young Earth creationists]] and such types, who posit that natural law has changed over time; specifically, that it has been [[Goddidit|altered by God]] for the purpose of resolving some messy inconsistencies of observed phenomena with the Honest-To-God Truth<sup>TM</sup> found in [[Genesis]].

An example is the challenge against [[radiocarbon dating]]<ref group=note>Some people, probably cribbing their arguments from the same source, have claimed this is extensible to ''all'' similar forms of dating as to use [[Radiometric_dating#Uranium-lead_dating|uranium]] instead</ref> taken up by the people of the {{wpl|Institute for Creation Research|RATE}} committee which in condensed form follows this format:

* '''Scientist:''' By measuring the decay of carbon-14 in organic material, one can ascribe dates to fossils up to 60,000 years old.
* '''Creationist:''' That contradicts the [[Creation Week|biblical account of creation]], so it's false.
* '''Scientist:''' But the radiocarbon dates line up perfectly with dates we know from other sources back 4,000 years.
* '''Creationist:''' You're working from the false premise of ''uniformitarianism''. The truth is that the rate of radioactive decay changed during the [[Great Flood]], so hundreds of thousands of years' worth of radioactive decay happened in a few days.<ref>[http://www.asa3.org/ASA/education/origins/rate-ri.htm Review - Assessing the RATE Project]</ref>
* '''Scientist:''' Er, that level of radiation would have generated enough heat to vaporize the Earth and [[nuke]] [[Noah]].
* '''Creationist:''' Oh, [[Reality-based community|ye of little faith]]. Do you not see that [[Goddidit|God also expanded the universe at the same time]] to keep 
everything
 only the radioactive elements cool?<ref>[http://www.icr.org/article/rate-review-unresolved-problems/ The ICR discusses the RATE Project]</ref>

(We told you [[Occam's razor|it was messy]].)

===Other criticisms===
Another criticism takes the milder approach of positing that it is a ''very'' big step to assume that in the few thousand years humans have been observing natural law, they have captured with any accuracy the principles by which the universe has operated for some 13 billion years.

This shortcoming is illustrated in a story about Charles Babbage. In order to make a point about miracles, Babbage would set his Difference Engine to wind from 2 to 4 to 6 to 8 to 10 to 117; his point being that a supposed "miracle" (the departure from an arithmetic progression) might only be the operation of some higher natural law hitherto unknown (''i.e.'', God did not need to meddle with the gears in the Difference Engine for the departure to happen).

Hume believed that induction might be a good form of reasoning, but we don't have good reason for believing it. It rests on an unjustified assumption that the future would behave like the past. He thought that trying to justify induction with induction is circular reasoning.<ref>https://www.youtube.com/watch?v=9_Gor1E8IxI</ref>

Uniformitarianism is a good and useful principle, but it can be taken too far. Stephen Jay Gould tells a story of an early professor of his who took uniformitarianism to such an absurd extreme that he insisted the ''rate'' of erosion remained uniform over time (a claim that uniformitarianism never made — it rules out processes, not changes in the rate of processes). When J Harlan Bretz<ref group=note>Bretz, as a personal quirk, ''insisted'' that his first initial never be written with a period.</ref> raised his theory of the Missoula Floods, it was proper that such a bold claim should be challenged; but other geologists, in the name of uniformitarianism, not only dismissed the theory out of hand but ''refused to even look at the evidence Bretz offered''. Shaving off the beard is good barbering; shaving off flesh is not.

=== Answering criticisms ===
These criticisms may be answered by pointing out that a large number of predictions based on uniformitarianism (in [[astronomy]], for example) have turned out to be very accurate, and thus there is absolutely no harm in assuming uniformity.

In addition to the fact that uniformitarianism as an assumption works, its premise is also a reasonable one when we [[Occam's razor|shave its beard]]. To postulate that mechanisms and rates were different in the past would require a researcher to determine not only what those mechanisms were but ''why they are different from the mechanisms in operation today''. Creationists will often claim that radioactive decay was different during "Creation Week", thus fudging the numbers to come up with any age they like, although not one shows any evidence of ''why'' they were faster or ''how'' the rates changed. Not to mention the side effects of extremely enhanced rates, such as where they claim millions of years' worth of radioactivity could happen in days, releasing enough energy to blow apart the planet (as mentioned above). On the other hand, the structure of rock strata, cratering, and weathering (along with ''many'' other factors that scientists have looked at) support uniformitarianism. Creationists are left with their one main handy [[creationist escape hatches|escape hatch]]: [[Goddidit]]!

Modern uniformitarianism, unlike conceptions that existed in earlier times, accepts that exceptional and extreme events, unknown in the time frame of humans, may have occurred in the past. Examples include the Messinian Salinity Crises (during which the Mediterranean Sea closed and almost completely dried up), the almost unimaginably extreme volcanism of the American West during the mid-Cenozoic, the meteor impact that killed the (non-avian) [[dinosaurs]], and the astoundingly huge floods emanating from glacial lakes during the [[Ice Age]]s.

However, [[Occam's Razor]] rules, and such events are to be invoked only when no more mundane ("uniform") explanation covers the observed facts. In this sense, uniformitarianism is an application of Occam's Razor to natural processes.

==See also==
*[[Induction]]

==Notes==
{{reflist|group=note}}

==References==
{{reflist}}

[[Category:Science]]

Categories: Science