Plant growth responses to elevated atmospheric CO2 are increased by phosphorus sufficiency but not by arbuscular mycorrhizas

By Iver Jakobsen et al. Capturing the full growth potential in crops under future elevated CO2 (eCO2) concentrations would be facilitated by improved understanding of eCO2 effects on uptake and use of mineral nutrients. This study investigates interactions of eCO2, soil phosphorus (P), and arbuscular mycorrhizal (AM) symbiosis in Medicago truncatula and Brachypodium distachyon grown 

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Matt Ridley: Global Warming versus Global Greening

By Matt Ridley [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 think the scientific method is humankind’s greatest achievement, and that there is no higher calling. So 

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18 New Papers Link High Solar Activity To Medieval And Modern Warmth, Low Solar Activity To Little Ice Age Cooling

By Kenneth Richard It is generally accepted that the climate warms during periods of strong solar activity (e.g., the Medieval Warm Period) and cools during periods of low solar activity (e.g., the Little Ice Age).” —Lyu et al., 2016 Within the last 1,000 years, global-scale surface temperatures underwent a warm period during Medieval times, centennial-scale 

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The Case Against a U.S. Carbon Tax

By Robert P. Murphy, Patrick J. Michaels, and Paul C. “Chip” Knappenberger Some proponents of federal policies to combat climate change are arguing for a federal carbon tax (or similar type of “carbon price”). Within conservative and libertarian circles, some proponents claim that a revenue-neutral carbon tax “swap” could deliver a double dividend, reducing climate 

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CO2 and greening observations indicate increasing light-use efficiency in northern terrestrial ecosystems

By Rebecca T. Thomas et al. Abstract. Observations show an increasing amplitude in the seasonal cycle of CO2 (ASC) north of 45° N of 56 ± 9.8% over the last 50 years and an increase in vegetation greenness of 7.5-15% in high northern latitudes since the 1980’s. However the causes of these changes remain uncertain. Historical 

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How Gaia and coral reefs regulate ocean pH

By Jim Steele Although some researchers have raised concerns about possible negative effects of rising CO2 on ocean surface pH, there are several lines of evidence demonstrating marine ecosystems are far more sensitive to fluxes of carbon dioxide from ocean depths and the biosphere’s response than from invasions of atmospheric CO2. There is also ample 

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Scientists: ‘Climate Model Simulations That Include Anthropogenic Forcing Are Not Compatible With Observed Trends’

By Kenneth Richard According to a recently published paper in the journal Science, (Cook et al., 2016, “Ocean forcing of glacier retreat in the western Antarctic Peninsula”), between 1945 and 2009 the mean ocean temperature warmed at depths of 150 to 400 meters for about 3/4ths of the waters surrounding the western Antarctic Peninsula (AP).  

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What is the relationship between Arctic sea ice decline and Eurasian cold winters?

by Judith Curry We conclude that the observed cooling over central Eurasia was probably due to a sea-ice-independent internally generated circulation pattern ensconced over, and nearby, the Barents–Kara Sea since the 1980s. — McCusker et al. Published earlier this week in Nature Geoscience: Twenty-five winters of unexpected Eurasian cooling unlikely due to Arctic sea-ice loss 

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