Have you looked at climate changes over the entire Cenozoic, let alone the climate record over the last 300,000 years?

We're lucky to be alive during a warm, interglacial period.

https://en.wikipedia.org/wiki/Last_Glacial_Maximum

Relevant xkcd: https://xkcd.com/1732/

This puts everything in context.... Visualization is a powerful tool.

We're at a periodic (125,000 year) temperature peak. Warming is surely a natural event. http://donath.org/Photos/TempChange.PNG

Ah yes, the overwhelming majority of scientists is in disarray over proof of the unusually fast rate of climate change with a decades long political campaign to finally make our profit-oriented societies pay some attention to the issue.

But in comes the HN smartass who definitely knows better than thousands of trained PhDs cumulating millions of man hours of research and convinces us all with a hyperlink to donath.org.

Why not destroy such sceptics (on HN or anywhere else) regarding the rate of climate change and related topics? All you have to do is demonstrate that the data presented by them & their interpretation is garbage, nonsense or whatever else you want to call it. Must surely be easier than presenting a classic logical fallacy - argument by authority and thinking that nails it.

Maybe the link is indeed total rubbish but talking about man-hours and 'trained PhD's' is irrelevant. Feynman explains nicely: https://youtu.be/EYPapE-3FRw. Science is a matter of a debate on facts versus theory not a vote-counting appeal on behalf of the supposed position of an ill-defined electorate.

I can demonstrate to someone that the Earth is round, but it'll never convince a Flat Earther.

Said skeptics have been repeatedly debunked, here and elsewhere. There's more to it than merely being right.

As an example, a sitting US Senator used "it snowed in winter" to "debunk" the idea of climate change. https://www.washingtonpost.com/news/the-fix/wp/2015/02/26/ji...

Indeed. I presented facts, he resorts to insults. Who's scientific?

Scientism dictates that the ordained technocrats have an exclusive license on what is science-y. Apparently incivility is fine when it supports the establishment consensus. Intellectual curiosity indeed.

What's "smartass" about taking the time to acquire NOAA ice core data, graphing it, and presenting it? We're at a recurring peak, that's scientifically plain.

No, it's not. Stop spreading false information.

Graph is from NOAA ice core data.

What's false?

He's actually correct on both points. Just look at any source for global temperature over the past million years. Eg. Wikipedia https://en.wikipedia.org/wiki/Geologic_temperature_record

It's not that simple. The graphs you are pointing at do not include the last century, and even if - they are tracing temperature by a proxy: bentic foraminifers dO16/O18. They are organisms living in the oceans, not necessarily in equilibrium (=synchronized) with atmospheric O and a proxy for average global temperatures. They are good indicators for general trends, so to understand the range of temperatures in a given period, but for very short periods of time they are unable to provide a measure of the rate of change. +3 degrees in a million year is manageable by many species,+3° in a century it isn't.

That doesn't stop it being true. If the temperature is even higher than the million year record, we're still at a peak.

temperature is not a concern, Life can exists in a relative large range of temperatures. The problem is the speed of temperature rise, that is incompatible with the speed some species can migrate from now-hostile areas. Dinosaurs didn't died because the asteroid hit their head, but because of the abrupt climate change triggered by it. The key word is "abrupt" not "change".

"The warming" we're currently experiencing is not natural. That we're coming out of an ice age doesn't matter for the warming we've been experiencing in the last hundred years.

What's it got to do with the last 100 years? We're talking about a 100,000 year temperature cycle and Greenland's melting cycle which started before humans influenced it so it wasn't caused by humans. I think all you people replying to me think I'm a global warming denier but you can't argue with what I've said because I'm right so you're just saying random facts instead.

The assertion that no one can argue with what you've said poisons the well and isn't particularly well-suited to a discussion board. If the whole of your argument is just linking to a Wikipedia article with your arms crossed in satisfaction, I suggest visiting https://skepticalscience.com/heading-into-new-little-ice-age...

Indeed the warming is a natural event. The glaciers melted long before humanity could make any difference.

The new bit is that we are helping it along at what is probably an unprecedented rate. So it's not about the change. It is about the rate of change.

When I was born the atmosphere had ~314 PPM of CO2. It is now north of 415PPM and going up ~2.5PPM per year. CO2 is a greenhouse gas.

Now how could that relate to us requiring over 95,000,000 barrels of oil PER DAY to run our civilization? (it is closer to 98M in 2021)

https://www.statista.com/statistics/265203/global-oil-produc....

For perspective do some back of the napkin math on the height 98,000,000 barrels of oil would be if you made a 100x100 base of barrels and stacked them vertically. Standard drums have inside dimensions of 572 millimetres (22.5 in) diameter and 851 millimetres (33.5 in) height. (remember that's per day)

We have in all probability made the time when coastal cities are flooded happen sooner and it is highly unlikely that we can improve the situation very much in the short term.

You're spreading disinformation. Do your homework before repeating random exaggerated claims you've heard on the internet. Climate change is not predicted to exterminate humans. This melting cycle was happening before the industrial revolution and was not created by humans.

As a geologist: we are not concerned about the change, we are concerned about the rate of change. The fastest is the change, the largest number of groups of organisms will be exinct.

That's neither here nor there. Do you disagree with anything I said? Are you trying to suggest humans are likely to go extinct because of human-caused climate change? If you are, then you'll need some better evidence than appeal to your qualifications.

I'm replying exactly to your assertion "Do your homework before repeating random exaggerated claims you've heard on the internet". I did, I didn't get my qualifications searching on Wikipedia, did you? "This melting cycle was happening before the industrial revolution and was not created by humans.": the cycle existed before humans, I agree, but the velocity of temperature change has increased after humans started to burn fossil fuels and deforestate.We are increasing the rate of change.

>I didn't get my qualifications searching on Wikipedia, did you?

In fairness, Wikipedia's coverage would support the more alarmist narrative. Skepticism and nuance are framed as conspiracy theory.

In my reading of Wikipedia's editorial position someone who took their articles at face value would be inclined to support your tilting.

I'm not really sure what to make of your replies. I've just been correcting some factual errors people made. You seem to agree with me but using a tone that sounds argumentative and adding some disconnected additional facts which nobody was denying and which are common knowledge. Are you engaging in an ideological fight with someone who's not present here?

I understand that you are correcting some assertions, but the way you did questioned the scientific competence of other contributors is reducing the value of the entire sentence you were replying to. You are throwing out the baby with the bath water. The key message I wanted to stress, with additional contributions to the discussion, is that we have to be concerned. If you agree with me on this I'm fine. Unfortunately however your corrections suffered the same problem of the ones you were correcting. In particular I do not agree with you on these two sentences: "Climate change is not predicted to exterminate humans." It is. It's not predicted to make Homo sapiens sapiens extinct, like you probably meant, but many humans can be exterminated by repentine climate changes (think to famine, wars, drought). "This melting cycle was happening before the industrial revolution and was not created by humans." Human-made contributions are perturbing the cyclicity, to an extent that can lead to a non-cyclical patterns.

> "Climate change is not predicted to exterminate humans." It is. It's not predicted to make Homo sapiens sapiens extinct, like you probably meant

Sorry, but the only legitimate way to interpret "climate change is predicted to exterminate humans" is as a claim that the species will go extinct.

You do not appear to be a native English speaker:

> the way you did questioned the scientific competence of other contributors is reducing the value of the entire sentence you were replying to

> you probably do not understand what I've wrote

> I wrote [?] the people that paid my education

You're probably better off not trying to do fine interpretation on English sentences.

Broadly speaking there's a long history of doomsday predictions. Credentialed members of academia or religious institutions have participated in doomsaying throughout history.

https://en.wikipedia.org/wiki/List_of_dates_predicted_for_ap...

Regardless of if the claim is or isn't being semantically backpedaled, I think historical context is important here.

It's not an issue of backpedaling. There are several different people in the comment chain. furins isn't obligated to stand by brainless' claims. I'm just saying he should be able to read them before declaring whether they're true or false.

The chain starts like this:

> The problem is not with the Earth. It is that we, humans, we likely not survive if this cycle of climate change continues.

This person has gone out of his way to be explicit that he believes humanity is about to go extinct.

> Climate change is not predicted to exterminate humans.

This response uses different, less dramatized wording for the same idea.

But then:

> I do not agree with you on these two sentences: "Climate change is not predicted to exterminate humans." It is. It's not predicted to make Homo sapiens sapiens extinct, like you probably meant

furins is trying to make an argument about the meaning of a sentence without being able to understand the sentence. This is a bad idea.

Extinction of the species, not killing of some individuals. I thought that was clear all along. It comes from "It is that we, humans, we likely not survive".

You might just be shocked by words like "not caused by humans" and have reacted reflexively. Sometimes climate changes really aren't caused by humans.

you probably do not understand what I've wrote but it's fine, it's your right. I'm not replying to you anymore, I wrote the people that paid my education in order to study palaeoclimatology and give a educated opinion in their place when necessary. They can hopefully read my messages with a more open mind. I tried to make them constructive and informative, and I'm open to constructive questions.

You were being sealioned. You're more patient than I am.

> Are you engaging in an ideological fight with someone who's not present here?

Quit with the red herrings. It's fairly easy to comprehend what is being said here.

"The velocity of temperature change has increased after humans started to burn fossil fuels and deforestate. We are increasing the rate of change."

Yes that's common knowledge. So what?

> This melting cycle was happening before the industrial revolution and was not created by humans.

If you're referring to our current predicament, it looks like you have your own homework to do.

You really can just Google this. We came out of an ice age 10,000 years ago and glaciers are still melting from then.

Why are so many commenters just making false knee-jerk claims without paying attention to well established science?

I'm a geologist and I've focused on palaeoclimatology putting an eye on the rate of climate change. I've wrote several articles on international peer-reviewed journals. I can say, basing on 20+years of study and lab/field work, that what is happening is really concerning because human emissions are summing up to natural Milankovitch cycles, altering the rate of climate change with unpredictable (since they are unprecedented) implications for food chain supply and society.

There are two melting cycles overlapping here. The cycle coming out of the last ice age, and the human caused warming. That latter is really stark in the velocity of change. It's not yet that stark in total magnitude, but it's also not linear with most of the change coming at the end in the future. It's looking like we may be headed for 4 degrees of average warming, which is pretty terrifying. That might just be enough to end the cycles of ice ages that's been happening for millions of years - which could be overall positive for us long term. But shorter term the disruptions to our cities, countries, and food supply is unprecedented in recorded history.

> Why are so many commenters just making false knee-jerk claims without paying attention to well established science?

I can't find any of this "well established science". Kindly link a primary source.

A primary source showing that Greenland was melting since preindustrial times? Really? No, sorry. It's not contentious at all. If you genuinely disagree, then I'll put some effort into it. Or is it something else you're asking for a source for?

EDIT: Turns out it is contentious because there are multiple cycles spanning different time periods so we're probably talking about different ones. I'm talking about the general holocene but there's also a separate human caused increased melt rate which is obviously post-industrial.

Translation of what you wrote: "I have nothing to back up my false claims, so I'll just splutter in outrage."

What you are doing here is not helpful. Yes, the Greenland ice sheet has been melting since before industrialization [1]. Yes, at current rates the ice will take 10,000 years to melt, as long as Jericho has been a city [2].

Productive responses to these claims include: Greenland's rate of melting has dramatically accelerated since industrialization and will likely continue accelerating as atmospheric carbon rises further.

and

Even losing a small percentage of the ice sheet will have devastating consequences in some regions.

These responses have a remote shot at making someone think about their position and whether it makes sense. Snarky answers where you accuse someone of ignorance over their informed claims only make you and your side look bad. I'm on your side, and I don't care for it.

[1] https://www.nationalgeographic.com/science/article/greenland...

[2] A little more tricky, sources rightly refuse to assume constant melt rate for their models. We can eyeball this, though. https://www.smithsonianmag.com/smart-news/greenlands-oldest-... gives amount of ocean rise in the last 8 years (as of 2019) as a quarter inch, and says 25 feet total ocean rise if the whole thing melted. 4 quarter in./in. * 12 in./ft * 25 ft * 8 years = ~9600 years

> This melting cycle was happening before the industrial revolution and was not created by humans.

"Because I, exporectomy, decree this to be so! Facts, evidence, none of these are important, compared to my opinions."