Comments for Significant Figures by Peter Gleick

Comment on A Step toward Fixing the Colorado River by A Step toward Fixing the Colorado River –...

A Step toward Fixing the Colorado River –... — Wed, 15 May 2013 21:37:59 +0000

[...] More importantly, the new report – Water to Supply the Land: Irrigated Agriculture in the Colorado River Basin – explores the potential for agricultural management strategies to save water, without remove agricultural land from … [...]

Comment on A Step toward Fixing the Colorado River by Pace of Farmland Price Appreciation Eases Across Mid-South and Southeast; Outlook Grows Cautious | Land & Livestock International, Inc.

Wed, 15 May 2013 12:12:24 +0000

[...] A Step toward Fixing the Colorado River [Significant Figures by Peter Gleick] (scienceblogs.com) [...]

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by Peter Gleick

Peter Gleick — Wed, 15 May 2013 01:57:35 +0000

Up is down; down is up. Not much you can do when someone believes something so directly contradicted by evidence, physics, observations, and generally well-understood science. Good luck!

If there is any hope of reasoning, you might point them to the good rebuttals of all of the major denier points at http://www.skepticalscience.com, or some of the other good science websites.

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by DrStrangepork

DrStrangepork — Wed, 15 May 2013 00:44:16 +0000

The latest climate change denier that I must suffer arguing with claims that A) the insanely high CO2 levels are even greater evidence that we are on the precipice of a massive decline i global temperatures;and B) not only is there no evidence that CO2 is a greenhouse gas at all, but the scant evidence which does exist suggests the opposite – that rising temps cause a rise in CO2, and when the CO2 levels hit a certain balance with global temps, global temps plummet, as is seen in the ice core records. Considering we’ve been teetering along for the last ~10,000 years, as seen i the ice core records, we should be declining, and he claims we are, as average temps for the last 12-15 years have been level, not increasing.

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by Peter Gleick

Peter Gleick — Tue, 14 May 2013 17:24:26 +0000

I’m not sure the extent to which peer-reviewed science supports this claim (I reviewed some of the pieces cited in the linked comment site above), but leave this for others to address. My understanding of the current scientific evidence on paleo levels of greenhouse gases suggests it is very clear that current increases are both human caused and far outside the levels seen for hundreds of thousands, if not millions, of years.

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by pinroot

pinroot — Tue, 14 May 2013 15:46:56 +0000

Another perspective on historical CO2 levels:

http://www.geocraft.com/WVFossils/stomata.html

According to this, plant stomata is a better indicator of historic CO2 levels and there are reasons to question ice core CO2 readings, especially the low and “stable” reading of 280 ppm we are told existed prior to the Industrial Revolution.

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by Why the 400 ppm climate milestone is irrelevant : Renew Economy

Why the 400 ppm climate milestone is irrelevant : Renew Economy — Tue, 14 May 2013 02:35:53 +0000

[...] There are multiple people on my Twitter timeline mentioning the fact that CO2 levels have passed 400 ppM for the first time. Let’s just point to this well informed and interesting explanation by Peter Gleick on Scienceblogs, titled “The Last Time Atmospheric CO2 was at 400 parts per Million Humans Didn’t Exist.” [...]

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by Why The 400 PPM Milestone Is Irrelevant - Cleantech Reporter

Why The 400 PPM Milestone Is Irrelevant - Cleantech Reporter — Mon, 13 May 2013 21:55:32 +0000

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by - Solar Energy

- Solar Energy — Mon, 13 May 2013 21:18:57 +0000

Comment on The Last Time Atmospheric CO2 was at 400 parts per million Humans Didn’t Exist by Why The 400 PPM Milestone Is Irrelevant | CleanTechnica

Why The 400 PPM Milestone Is Irrelevant | CleanTechnica — Mon, 13 May 2013 19:01:32 +0000