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Carbon Dioxide or Solar Forcing? By: Nir J.

Carbon Dioxide or Solar Forcing?

Shaviv Natural or Anthropogenic? Which mechanism is responsible for global warming over the 20th century? According to the common perception, the temperature over the 20th century has been warming, and it is mostly anthropogenic in origin, with greenhouse gases (GHGs) being the dominant driver. Others, usually called "skeptics", challenge this view and instead claim that the temperature variations are all part of natural variability. The Good, the Bad and the Null Hypothesis. Guest post by David Middleton.

The Good, the Bad and the Null Hypothesis

Breaking Hockey Sticks: Antarctic Ice Core Edition. Guest post by David Middleton Ancient air bubbles trapped in ice enable us to step back in time and see what Earth’s atmosphere, and climate, were like in the distant past.

Breaking Hockey Sticks: Antarctic Ice Core Edition

They tell us that levels of carbon dioxide (CO2) in the atmosphere are higher than they have been at any time in the past 400,000 years. During ice ages, CO2 levels were around 200 parts per million (ppm), and during the warmer interglacial periods, they hovered around 280 ppm (see fluctuations in the graph). In 2013, CO2 levels surpassed 400 ppm for the first time in recorded history. This recent relentless rise in CO2 shows a remarkably constant relationship with fossil-fuel burning, and can be well accounted for based on the simple premise that about 60 percent of fossil-fuel emissions stay in the air.Today, we stand on the threshold of a new geologic era, which some term the “Anthropocene”, one where the climate is very different to the one our ancestors knew.

60 Papers: Low Sensitivity. By Kenneth Richard (a) Quantified Low Climate Sensitivity to Doubled CO2 Florides and Christodoulides, 2009 (2X CO2 = ~0.02°C) A very recent development on the greenhouse phenomenon is a validated adiabatic model, based on laws of physics, forecasting a maximum temperature-increase of 0.01–0.03 °C for a value doubling the present concentration of atmospheric CO2.

60 Papers: Low Sensitivity

On the Existence of a Tropical Hot Spot and The Validity of the US EPA's CO2 Endangerment Finding. Japanese Scientist Reiterates That CO2 Climate Sensitivity Is Overstated, “Theoretically Meaningless” Japanese scientist Kyoji Kimoto reiterates his belief that CO2 climate forcing has been grandly overstated.

Japanese Scientist Reiterates That CO2 Climate Sensitivity Is Overstated, “Theoretically Meaningless”

See original story here. Kyoji has sent the following essay to publish here at NTZ. . ======================================== On the Reproducibility of the IPCC’s climate sensitivity. Guest essay by Dr.

On the Reproducibility of the IPCC’s climate sensitivity

Antero Ollila. “Even doubling or tripling the amount of CO2′ will have ‘little impact’ on temps” From New Zealand Climate Science Professor Geoffrey G Duffy DEng, PhD, BSc, ASTC Dip., FRS NZ, FIChemE, CEng Dr.

“Even doubling or tripling the amount of CO2′ will have ‘little impact’ on temps”

Geoffrey G. Carbon Dioxide is not the Primary Cause of Global Warming: The Future Cannot Cause the Past. New Literature Strongly Suggests CO2 Residence Time In The Atmosphere Is Exaggerated! As usual, there are many highly interesting posts on climate science at the German Die kalte Sonne site.

New Literature Strongly Suggests CO2 Residence Time In The Atmosphere Is Exaggerated!

What follows is one of the latest, on Harde’s controversial paper: ======================================== By Dr. Sebastian Lüning and Prof. Fritz Vahrenholt (German text translated/edited by P Gosselin) CO2: "WHY ME?" (Rocket Scientist's Journal) 1.

CO2: "WHY ME?" (Rocket Scientist's Journal)

Estimates vary, but climatologists in the Consensus say that the atmosphere contains 730 Gtons (PgC) of carbon and the uptake to the oceans alone is at least 90 Gtons/year. It's a ninth grade algebra problem to calculate how long it takes to empty a bucket with 730 units at the rate of 90 units per year. Rate of Increasing Concentrations of Atmospheric Carbon Dioxide Controlled by Natural Temperature Variations. Celestial Climate Driver: A Perspective from Four Billion Years of the Carbon Cycle. The Mathematics of Carbon Dioxide, Part 1. The Mathematics of Carbon Dioxide Part 2. Guest essay by Mike Jonas Introduction.

The Mathematics of Carbon Dioxide Part 2

The Mathematics of Carbon Dioxide Part 3. Guest essay by Mike Jonas Introduction. The Mathematics of Carbon Dioxide Part 4. Guest essay by Mike Jonas A look at Equilibrium Climate Sensitivity from a logical perspective. Introduction. Detection and Attribution of Man-made Climate Change. By Andy May Chapter 10 of the 2013 IPCC Working Group 1 Assessment Report (WG1 AR5) report on climate change deals with how man-made climate change is detected and how much of the total change is due to man.

They call the chapter “Detection and Attribution of Climate Change: from Global to Regional,” but in the critical calculation they assume the natural contribution is zero, so we consider “man-made” an appropriate addition to the title of this post. In summary, it says that the Earth’s surface has warmed since 1880 and over half of the warming from 1951 to 2010 is due to man.

That humans have some influence on climate is not in dispute, all major species have some influence on climate. Phytoplankton occupy most of the Earth’s surface and, since they photosynthesize, they consume CO2 and produce sugars and oxygen. Feedback on Feedbacks. Guest essay by Rud Istvan In recent weeks, there have been a number of WUWT guest posts on climate sensitivity related matters. Sensitivity is determined by feedbacks to increased CO2. The delta T to doubled CO2 in the absence of feedbacks is 1.1-1.2C. Monckton calculated 1.166C in his new (and unfinished) ‘Feet of Clay’ series of posts; Lindzen used 1.2 for simplicity (below). The slight difference is of no matter for this mostly conceptual post. There have been a number of ‘skeptical’ comments and even guest response posts (FUBAR) that have gotten a lot of things ‘not quite right’ on this very important general subject including: 1. 2. 3. 4. Questions on the rate of global carbon dioxide increase.

Study: why CO2 levels are lower during global cold periods. From CALIFORNIA INSTITUTE OF TECHNOLOGY Deep-sea corals reveal why atmospheric carbon was reduced during colder time periods. Soil feedbacks are a big uncertainty in climate change. Apocalypse Cancelled, Sorry, No Ticket Refunds. Guest Post by Willis Eschenbach Estimates of future atmospheric CO2 values as a result of future emissions, called “scenarios”, fall into two camps—demand driven, and supply driven. A recent paper entitled “The implications of fossil fuel supply constraints on climate change projections: A supply-driven analysis” by J.Wang, et al., paywalled here, has a good description of the difference between demand and supply driven scenarios in their abstract: Greenland Temperatures Weaken Theory CO2 Drives Climate. Top Scientists: CO2-Induced Warming Is “Weak” To Non-Existent For Greenland, Antarctica!

By Kenneth Richard We routinely read about “highest ever” Arctic ice sheet and sea ice melt rates in the Arctic. And about rapid, “faster-than-expected” melting of ice shelves in West Antarctica. And then, of course, we’re told that sea levels are rising at an accelerating rate — a catastrophically accelerating rate — due to the amplified warming at the poles, or “polar amplification”. Limited sign of soil adaptation to climate warming. While scientists and policy experts debate the impacts of global warming, Earth's soil is releasing roughly nine times more carbon dioxide to the atmosphere than all human activities combined. Arctic Amplification? Temperature Misunderstandings. Clive Best provides this animation of recent monthly temperature anomalies which demonstrates how most variability in anomalies occur over northern continents.

Solar variability and the Earth’s climate. By Andy May According to Javier and the IPCC total solar radiation output varies little, less than 0.1%. The implications of fossil fuel supply constraints on climate change projections: A supply-side analysis. Can Earth be compared to Venus? Andy May Petrophysicist. Study: CO2 NOT causing climate change - Principia Scientific International. Industry Experts: CO2 Worse Than Useless in Trapping Heat/Delaying Cooling - Principia Scientific International.