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Climate, pCO2 and terrestrial carbon cycle linkages during late Palaeozoic glacial–interglacial cycles

Nature Geoscience Advanced Online - Sun, 10/23/2016 - 23:00

Nature Geoscience. doi:10.1038/ngeo2822

Authors: Isabel P. Montañez, Jennifer C. McElwain, Christopher J. Poulsen, Joseph D. White, William A. DiMichele, Jonathan P. Wilson, Galen Griggs & Michael T. Hren

Earth’s last icehouse, 300 million years ago, is considered the longest-lived and most acute of the past half-billion years, characterized by expansive continental ice sheets and possibly tropical low-elevation glaciation. This atypical climate has long been attributed to anomalous radiative forcing promoted by a 3% lower incident solar luminosity and sustained low atmospheric pCO2 (≤300 ppm). Climate models, however, indicate a CO2 sensitivity of ice-sheet distribution and sea-level response that questions this long-standing climate paradigm by revealing major discrepancy between hypothesized ice distribution, pCO2, and geologic records of glacioeustasy. Here we present a high-resolution record of atmospheric pCO2 for 16 million years of the late Palaeozoic, developed using soil carbonate-based and fossil leaf-based proxies, that resolves the climate conundrum. Palaeo-fluctuations on the 105-yr scale occur within the CO2 range predicted for anthropogenic change and co-vary with substantial change in sea level and ice volume. We further document coincidence between pCO2 changes and repeated restructuring of Euramerican tropical forests that, in conjunction with modelled vegetation shifts, indicate a more dynamic carbon sequestration history than previously considered and a major role for terrestrial vegetation–CO2 feedbacks in driving eccentricity-scale climate cycles of the late Palaeozoic icehouse.

Trump promises to shut down climate change funding

Climate Depot - Sat, 10/22/2016 - 15:18
http://www.independent.co.uk/news/world/americas/donald-trump-gettysburg-address-first-100-days-speech-trade-economy-wall-hilary-clinton-immigrants-a7375711.html His proposals include scrapping funding to UN climate change programmes.  . . .  “We’re paying billions of dollars [to the UN],” he said. “We’re going to fix our own environment.”

CAUGHT ON TAPE: UN bans skeptical journalists from climate summit for holding views not ‘particularly helpful’

Climate Depot - Fri, 10/21/2016 - 17:11
The United Nations has rejected the media credentials of three journalists from a conservative news outlet in Canada to the upcoming UN climate summit in Morocco in November. Nick Nuttall, a UN official, admitted in an October 18 CBC interview that The Rebel news outlet is being banned from attending the UN summit because of its skeptical [...]

UN sings, dances and digs itself into a climate hole over its Ezra Levant veto

Climate Depot - Fri, 10/21/2016 - 16:38
By Peter Foster He is Nick Nuttall, head of communications for the United Nations Framework Convention on Climate Change, UNFCCC, which is about to hold yet another cast-of-thousands climate conference, this time in Marrakech. … Nuttall, a former Environment and Technology Correspondent for The Times of London, was interviewed about his decision by Carol Off on [...]

CAUGHT ON TAPE: UN censor explains why he’s banning skeptical journalists from global warming conference

Climate Depot - Fri, 10/21/2016 - 15:27
Via: Ezra Levant This is a first for The Rebel: We’ve decided to take this episode of “The Ezra Levant Show” and make it available for free. That’s because this story is so important, we’re asking everyone to share it. As we reported earlier this week, a censor at the UN named Nick Nuttall has refused [...]

Super-resolution ribosome profiling in Arabidopsis [Plant Biology]

PNAS Early Edition Articles - Fri, 10/21/2016 - 13:58
Deep sequencing of ribosome footprints (ribosome profiling) maps and quantifies mRNA translation. Because ribosomes decode mRNA every 3 nt, the periodic property of ribosome footprints could be used to identify novel translated ORFs. However, due to the limited resolution of existing methods, the 3-nt periodicity is observed mostly in a...

Conformational landscape of human 26S proteasome [Biochemistry]

PNAS Early Edition Articles - Fri, 10/21/2016 - 13:58
The proteasome is the major engine of protein degradation in all eukaryotic cells. At the heart of this machine is a heterohexameric ring of AAA (ATPases associated with diverse cellular activities) proteins that unfolds ubiquitylated target proteins that are concurrently translocated into a proteolytic chamber and degraded into peptides. Using...

ASBEL-TCF3 complex and colorectal tumorigenesis [Cell Biology]

PNAS Early Edition Articles - Fri, 10/21/2016 - 13:58
Wnt/β-catenin signaling plays a key role in the tumorigenicity of colon cancer. Furthermore, it has been reported that lncRNAs are dysregulated in several steps of cancer development. Here we show that β-catenin directly activates the transcription of the long noncoding RNA (lncRNA) ASBEL [antisense ncRNA in the ANA (Abundant in...

Coclustering directed graphs [Statistics]

PNAS Early Edition Articles - Fri, 10/21/2016 - 13:58
In directed graphs, relationships are asymmetric and these asymmetries contain essential structural information about the graph. Directed relationships lead to a new type of clustering that is not feasible in undirected graphs. We propose a spectral co-clustering algorithm called di-sim for asymmetry discovery and directional clustering. A Stochastic co-Blockmodel is...

Kerry Praises Obama: ‘He Has Been Able to Circumvent Congress’ on Climate Change

Climate Depot - Fri, 10/21/2016 - 10:31
http://www.mrctv.org/blog/kerry-praises-obama-he-has-been-able-circumvent-congress-climate-change  Brittany M. Hughes | 3 hours ago In between waxing poetic about the coming climate apocalypse and exchanging no less than two dozen self-congratulatory praises for being such an awesome guardian of Planet Earth, Secretary of State John Kerry rejoicedduring a panel discussion on climate change that a great American industry responsible for supporting hundreds of [...]

Forget Paris: France Drops Carbon Tax Plan

Climate Depot - Fri, 10/21/2016 - 10:30
Forget Paris: France Drops Carbon Tax Plan http://www.thegwpf.com/forget-paris-france-drops-carbon-tax-plan/ The French government is set to drop plans to introduce a carbon tax, French financial daily Les Echos said on Thursday. The newspaper, quoting several sources, said the socialist government will not include the carbon tax in a draft 2016 budget update currently being discussed. Environment Minister [...]

Changes proposed to Japanese decommissioning

World Nuclear News - Fri, 10/21/2016 - 09:12
A proposal to change decommissioning rules in Japan could mean that operators will contribute to funds only during operation, and not, as previously, for a decade after final shutdown.

IAEA encourages further improvement at Paks plant

World Nuclear News - Fri, 10/21/2016 - 08:20
An International Atomic Energy Agency team of experts has concluded that the Paks nuclear power plant has improved operational safety by following recommendations and suggestions made in a 2014 IAEA review, but noted that further work is needed. The Operational Safety Review Team completed a five-day follow-up mission to the four-unit plant in central Hungary today.

Hillary Clinton’s Energy Blackout America: ‘Heavy reliance on wind & solar = huge costs & frequent failures’

Climate Depot - Fri, 10/21/2016 - 04:23
By Rupert Darwall — October 21, 2016 Three presidential debates in which there was only one question on the subject that, more than any other, would transform America under Hillary Clinton. “We can be the 21st-century clean-energy superpower and create millions of new jobs and businesses,” the Democratic nominee declared during the second debate. Does [...]

Matt Ridley: Global Warming Versus Global Greening

Climate Depot - Thu, 10/20/2016 - 14:14
Matt Ridley: Global Warming Versus Global Greening http://www.thegwpf.org/matt-ridley-global-warming-versus-global-greening/ 2016 ANNUAL GWPF LECTURE The Royal Society, London 17 October 2016 Matt Ridley delivers the 2016 Annual GWPF Lecture at the Royal Society, London 17 October I am a passionate champion of science. I have devoted most of my career to celebrating and chronicling scientific discovery. I [...]
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