Talk:Geologic temperature record

message: Hello i have recently proposed the Wikiproject Earth. This Wikiproject`s scope includes this article. This wikiproject will overview the continents, oceans, atsmophere and global warming Please Voice your opinion by clicking anywhere on this comment except for my name. --IwilledituTalk :)Contributions  —Preceding comment was added at 15:38, 30 March 2008 (UTC)
thread_title:  Wikiproject Earth 

message: Regardless of ISO/SI, the edit effectively makes the article unreadable for most.  The sense is clear with the unabbreviated form ("million years ago").  Why destroy it with a frankly obscure abbreviation ("Ma")?  --Gergyl (talk) 02:57, 14 May 2009 (UTC)
replies: text: Defined and wikilinked the first occurrence. Awickert (talk) 04:59, 14 May 2009 (UTC)
replies: text: Still not happy.  Regardless of standards, your abbreviation is not current common usage.  I cannot see how it is superior to the unabbreviated form that was used here.  Anyway, how is this english, "...ice age that began about 40 Ma with the glaciation of Antarctica"?  "Ma" means "million years" not "million years ago"; so s.r. "40 Ma ago".--Gergyl (talk) 04:49, 14 May 2009 (UTC)
replies: text: Sorry - forgot to sign earlier - I actually didn't change it to Ma; it's one of those weird things in that it is typically used for years ago. I didn't actually change it to Ma in the article; I'm not sure about common-common usage, but it is common scientific usage, so perhaps it will be useful (if properly linked and defined) to teach people what it means. Awickert (talk) 04:59, 14 May 2009 (UTC)
replies: text: WikiProject Geology suggests the use of 'million years ago' / 'million years' in full if practical, which I think it is in this instance.   I've implemented this with the  template. Martin (Smith609 – Talk) 13:16, 14 May 2009 (UTC)
thread_title:  "Ma" unit 

message: Looking around a bit I see two other Wikipedia articles (Temperature record and Temperature record of the past 1000 years) not even mentioned here, and similar enough that I think the relationship between these articles ought to be reviewed.  There is also the Paleoclimatology article (discussed above), which I think sets a standard this article has yet to attain.  Not that these should necessarily be combined – there is something to be said (as was said above) for this article being the narrower, more specifically focused article.  I think it would be to the betterment of the entire topic to have a broad review of just what each of these articles should cover, and how they can work together.  With that in place this article could work on various improvements. - J. Johnson (JJ) (talk) 20:54, 13 March 2010 (UTC)
thread_title:  General review and improvements needed. 

message: The article says multi-million to billion (109) year time scales. But the only ref in the "Evidence for past temperatures" section is for the recent ice-age cycles, ie the 100 kyr scale. Which isn't really geological. Does d-O-18 apply more than 1Myr ago? William M. Connolley (talk) 23:22, 25 November 2011 (UTC)
replies: text: δ18O does get used as a proxy for climate change over long times, though in those cases you are talking about the oxygen isotope content of either bulk sea sediments or fossil corals / shells.  Over long times, what you are mostly measuring is bulk changes in the ocean isotopic concentration as a proxy for the presence or absence of large ice sheets on land.  Dragons flight (talk) 23:52, 25 November 2011 (UTC)
thread_title:  Timescales 

message: The "Temperature of Planet Earth" histogram is misleading, not because of a change in timescales on the X-Axis, but because of a change in Units on the Y axis.
It's common to have the graduation marks change on graphs, especially across large timescales, in order to allow a high-level understanding of the trend over time. Logarithmic is extremely common in this regard.
However, it is scientifically unsound to use data in a graph without converting them to the same units. Multi-unit graphs in this nature would cause a journal submission to be rejected; it should not be acceptable here. Multi-unit graphs mislead the reader. To correct the graph, the graph author should convert the data points in the Fahrenheit section of the graph to Celsius, then regenerate the curve.
See Wiki : Misleading Graph : Improper Intervals/Units for more information.
155.70.39.45 (talk) 20:12, 7 January 2016 (UTC)
replies: text: There is no change in units. All that has happened in that the graph is labeled in oC on the L, and oF on the R. No? William M. Connolley (talk) 22:43, 7 January 2016 (UTC)
replies: text: I think you are right but the graph's heading is confusing. It is headed "Temperature of Planet Earth" when it means "Deviation of temperature from the 1960-1990 average". Biscuittin (talk) 23:25, 8 January 2016 (UTC)

text:  Celsius is the SI unit for temperature. Fahrenheit is the US unit for Temperature. 1 degree change Celsius is approximately 1.8 degrees change in Fahrenheit. They are not the same units. This is misleading because this change of units exaggerates the change in temperature in the final panel in comparison with the fluctuations in temperature in the other panels.(OP)155.70.39.45 (talk) 15:55, 11 January 2016 (UTC)
replies: text:  There is no change in units - please read what I wrote, and keep reading it until you understand it William M. Connolley (talk) 16:00, 11 January 2016 (UTC)
thread_title:  "Temperature of Planet Earth" Is Misleading due to Change in Units 

message: The article focuses a lot on recent 3 million years, which is ok. But the earth existed before that too. It would be nice if we could get a more GENERAL overview on top of the article about the whole earth + temperature. I came to this article trying to find out the average temperature here and there during the dinosaur age, so to me, right now, the recent 3 million years are useless. 2A02:8388:1603:CB00:D127:6107:A96E:296A (talk) 10:59, 14 January 2018 (UTC)
replies: text: That seems like an unreasonable complaint. Did you look at the pictures? William M. Connolley (talk) 11:39, 14 January 2018 (UTC)
thread_title:  Current focus of this wikipedia article 

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thread_title:  External links modified (January 2018)