Comments on: The big picture: 65 million years of temperature swings http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/ Tackling tribal groupthink Wed, 23 May 2012 13:49:10 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Adrian Willis http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-1028297 Adrian Willis Sun, 01 Apr 2012 13:06:45 +0000 http://joannenova.com.au/?p=6832#comment-1028297 Is this GISP2 Ice Core data crap, cause there was an ice age 10000 years ago. Are you telling me that the temperature is less today than in the ice age. What a joke! Is this GISP2 Ice Core data crap, cause there was an ice age 10000 years ago. Are you telling me that the temperature is less today than in the ice age. What a joke!

Report this

00

]]> By: Anthropogenic Global Warming, or just Natural Variation? | warmingtruth http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-1002580 Anthropogenic Global Warming, or just Natural Variation? | warmingtruth Tue, 06 Mar 2012 19:59:25 +0000 http://joannenova.com.au/?p=6832#comment-1002580 [...] http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/ [...] [...] http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/ [...]

Report this

00

]]> By: Spare Me the Change « SlowFacts http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-969990 Spare Me the Change « SlowFacts Thu, 16 Feb 2012 12:32:33 +0000 http://joannenova.com.au/?p=6832#comment-969990 [...] http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/ [...] [...] http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/ [...]

Report this

00

]]> By: In China There Are No Hockey Sticks | CLIMATE HIMALAYA-Fostering Knowledge, Innovations and Adaptation http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-904354 In China There Are No Hockey Sticks | CLIMATE HIMALAYA-Fostering Knowledge, Innovations and Adaptation Mon, 02 Jan 2012 04:46:04 +0000 http://joannenova.com.au/?p=6832#comment-904354 [...] with hundreds of other studies from all around the world (from Midieval times, Roman times, the Greenland cores). Why can’t we do good tree-ring analysis like this from many [...] [...] with hundreds of other studies from all around the world (from Midieval times, Roman times, the Greenland cores). Why can’t we do good tree-ring analysis like this from many [...]

Report this

00

]]> By: Climate Change by rustythecat - Pearltrees http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-781128 Climate Change by rustythecat - Pearltrees Sun, 04 Dec 2011 04:28:14 +0000 http://joannenova.com.au/?p=6832#comment-781128 [...] The big picture: 65 million years of temperature swings « JoNova: Science, carbon, climate and tax The last five million years of climate change is shown in the next graph based on work by Lisiecki and Raymo in 2005 [2] . It shows our planet has a dynamic temperature history, and over the last three million years, we have had a continuous series of ice ages (now about 90,000 years each) and interglacial warm periods (about 10,000 years each). There are 13 (count ‘em) ice ages on a 100,000 year cycle (from 1.25 million years ago to the present, and 33 ice ages on a 41,000 year cycle (between 2.6 million and 1.25 million years ago). Since Earth is on a multi-million-year cooling trend, we are currently lucky to be living during an interglacial warm period, but we are at the end of our normal 10,000 year warm interglacial period. [...] [...] The big picture: 65 million years of temperature swings « JoNova: Science, carbon, climate and tax The last five million years of climate change is shown in the next graph based on work by Lisiecki and Raymo in 2005 [2] . It shows our planet has a dynamic temperature history, and over the last three million years, we have had a continuous series of ice ages (now about 90,000 years each) and interglacial warm periods (about 10,000 years each). There are 13 (count ‘em) ice ages on a 100,000 year cycle (from 1.25 million years ago to the present, and 33 ice ages on a 41,000 year cycle (between 2.6 million and 1.25 million years ago). Since Earth is on a multi-million-year cooling trend, we are currently lucky to be living during an interglacial warm period, but we are at the end of our normal 10,000 year warm interglacial period. [...]

Report this

00

]]> By: Baa Humbug http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-614486 Baa Humbug Thu, 20 Oct 2011 23:00:54 +0000 http://joannenova.com.au/?p=6832#comment-614486 <blockquote>More misrepresentation. Lappi is right, it’s not rocket science – although it does involve satellites – but it remains something he fails to understand. The Antarctic ice mass is decreasing rapidly</blockquote> Speaking of lies and misrepresentation, define "rapidly" (how long before it all disappears and what temperatures are necessary to cause that disappearance) and show proof that the ice mass has/hasn't changed at similar rates in the past. Furthermore, some citations about "The Antarctic ice mass is decreasing" would do your credibility some favours. <blockquote>Paleoclimatology is the study of changes in climate taken on the scale of the entire history of Earth. There is no lack of long-term perspective in the field of climate science. </blockquote> The above is a true statement. However the key is the uncertainty factor i.e. how accurate are proxies? care to show some error bands on some of these "perspectives"?

More misrepresentation. Lappi is right, it’s not rocket science – although it does involve satellites – but it remains something he fails to understand. The Antarctic ice mass is decreasing rapidly

Speaking of lies and misrepresentation, define “rapidly” (how long before it all disappears and what temperatures are necessary to cause that disappearance) and show proof that the ice mass has/hasn’t changed at similar rates in the past.
Furthermore, some citations about “The Antarctic ice mass is decreasing” would do your credibility some favours.

Paleoclimatology is the study of changes in climate taken on the scale of the entire history of Earth. There is no lack of long-term perspective in the field of climate science.

The above is a true statement. However the key is the uncertainty factor i.e. how accurate are proxies? care to show some error bands on some of these “perspectives”?

Report this

00

]]> By: Tristan http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-613948 Tristan Thu, 20 Oct 2011 17:17:28 +0000 http://joannenova.com.au/?p=6832#comment-613948 I find the article somewhat less informative. Statements like <blockquote>Our current warming is well within natural variation, and in view of the general decline in temperatures during the last half of this interglacial, is probably beneficial for mankind and most plants and animals</blockquote> are purely misleading. Furthermore, pretending that climate science doesn't already examine precisely this data is plain spurious. <blockquote>We geologists owe it to policy-makers to give them the benefit of our longer-term perspective.</blockquote> Paleoclimatology is the study of changes in climate taken on the scale of the entire history of Earth. There is no lack of long-term perspective in the field of climate science. <blockquote>Both the Antarctic and Greenland ice sheets are thickening: Leave anything on the ice, and it gets buried pretty fast (for example: the US South Pole Base was recently reconstructed because the old base was being crushed by snow and ice, and WWII planes lost on Greenland’s southeast coast, were covered by 264 feet of ice in 50 years: see the image below). This is not rocket science. Sure, the sea-level edges are retreating (that is why we call them the ablation zones of a glacier), but they represent a minute portion of the continent-scale ice mass.</blockquote> More misrepresentation. Lappi is right, it's not rocket science - although it does involve satellites - but it remains something he fails to understand. The Antarctic ice mass is decreasing rapidly, and despite what he implies, that doesn't save things from being buried under ice. <blockquote>Since we don’t know if the long-term climate is cooling or warming (I bet on cooling long-term), we could spend trillions to cut emissions, only to have the climate cool catastrophically on its own. What then? Pump as much CO2 into the air as possible?</blockquote> You should take his bet, because it flies in the face of physics. I find the article somewhat less informative. Statements like

Our current warming is well within natural variation, and in view of the general decline in temperatures during the last half of this interglacial, is probably beneficial for mankind and most plants and animals

are purely misleading. Furthermore, pretending that climate science doesn’t already examine precisely this data is plain spurious.

We geologists owe it to policy-makers to give them the benefit of our longer-term perspective.

Paleoclimatology is the study of changes in climate taken on the scale of the entire history of Earth. There is no lack of long-term perspective in the field of climate science.

Both the Antarctic and Greenland ice sheets are thickening: Leave anything on the ice, and it gets buried pretty fast (for example: the US South Pole Base was recently reconstructed because the old base was being crushed by snow and ice, and WWII planes lost on Greenland’s southeast coast, were covered by 264 feet of ice in 50 years: see the image below). This is not rocket science. Sure, the sea-level edges are retreating (that is why we call them the ablation zones of a glacier), but they represent a minute portion of the continent-scale ice mass.

More misrepresentation. Lappi is right, it’s not rocket science – although it does involve satellites – but it remains something he fails to understand. The Antarctic ice mass is decreasing rapidly, and despite what he implies, that doesn’t save things from being buried under ice.

Since we don’t know if the long-term climate is cooling or warming (I bet on cooling long-term), we could spend trillions to cut emissions, only to have the climate cool catastrophically on its own. What then? Pump as much CO2 into the air as possible?

You should take his bet, because it flies in the face of physics.

Report this

00

]]> By: Sarah Doyle http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-613600 Sarah Doyle Thu, 20 Oct 2011 14:08:24 +0000 http://joannenova.com.au/?p=6832#comment-613600 I'm reading this in October 2011. I found the article interesting and informative (I'm not a geologist or a scientist, but am interested.) The article seems reasonable, but when I get to the Comments, I see that an awful lot of them are just as politics-driven and petty as the worst of the GW "believers" they talk about. I’m reading this in October 2011. I found the article interesting and informative (I’m not a geologist or a scientist, but am interested.) The article seems reasonable, but when I get to the Comments, I see that an awful lot of them are just as politics-driven and petty as the worst of the GW “believers” they talk about.

Report this

00

]]> By: Fire, Ice and Precautions | monorealism.com http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-237637 Fire, Ice and Precautions | monorealism.com Sat, 19 Mar 2011 08:05:17 +0000 http://joannenova.com.au/?p=6832#comment-237637 [...] out a very interesting post by David Lappi on trends in global temperature: not just the last 100 years, but the last 10,000 years, the last 5 million years and the last 65 [...] [...] out a very interesting post by David Lappi on trends in global temperature: not just the last 100 years, but the last 10,000 years, the last 5 million years and the last 65 [...]

Report this

00

]]> By: The best shot? | The Rational Optimist… http://joannenova.com.au/2010/02/the-big-picture-65-million-years-of-temperature-swings/#comment-128979 The best shot? | The Rational Optimist… Sat, 20 Nov 2010 10:58:52 +0000 http://joannenova.com.au/?p=6832#comment-128979 [...] this (from "The big picture: 65 million years of temperature swings" by Jo Nova and [...] [...] this (from "The big picture: 65 million years of temperature swings" by Jo Nova and [...]

Report this

00

]]>