Rise in CO2 has greened planet Earth

Surprise surprise…more CO2, more green planet. The alarmists seem to be quite upset about all the new greenery growing around the world as it doesn’t fit well with the IPCC-generated hysteria about harmful AGW.

Climate Etc.

by Judith Curry

We show a persistent and widespread increase of growing season integrated LAI (greening) over 25% to 50% of the global vegetated area, whereas less than 4% of the globe shows decreasing LAI (browning). Factorial simulations with multiple global ecosystem models suggest that CO2 fertilization effects explain 70% of the observed greening trend. – Zhu et al.

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Updated climate sensitivity estimates

Climate Etc.

by Nic Lewis

An update to the calculations in Lewis and Curry (2014).

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Gavin Schmidt and Reference Period “Trickery”

Climate Audit

In the past few weeks, I’ve been re-examining the long-standing dispute over the discrepancy between models and observations in the tropical troposphere.  My interest was prompted in part by Gavin Schmidt’s recent attack on a graphic used by John Christy in numerous presentations (see recent discussion here by Judy Curry).   christy_comparison_2015Schmidt made the sort of offensive allegations that he makes far too often:

@curryja use of Christy’s misleading graph instead is the sign of partisan not a scientist. YMMV. tweet;

@curryja Hey, if you think it’s fine to hide uncertainties, error bars & exaggerate differences to make political points, go right ahead.  tweet.

As a result, Curry decided not to use Christy’s graphic in her recent presentation to a congressional committee.  In today’s post, I’ll examine the validity (or lack) of Schmidt’s critique.

Schmidt’s primary dispute, as best as I can understand it, was about…

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The paradox of the climate change consensus

Climate Etc.

by Judith Curry

In our view, the fact that so many scientists agree so closely about the [causes of the] earth’s warming is, itself, evidence of a lack of evidence for [human caused] global warming. – D. Ryan Brumberg and Matthew Brumberg

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Are You New To the Global Warming Debate? James Hansen Admits a Couple of Things about Global Temperatures and Sea Levels You Should Know

Bob Tisdale - Climate Observations

Yale University’s Katherine Bagley interviewed James Hansen, former director of NASA’s Goddard Institute for Space Studies, in the post For James Hansen, the Science Demands Activism on Climate at YaleEnvironment360.  That interview was replayed in the article Climate scientist James Hansen ‘I don’t think I’m an alarmist’ at The Guardian.

In that interview, Hansen admitted a couple of basic things that many people do not realize.  So if you’re new to discussions of global warming and rising sea levels read on.

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DeConto and Pollard – An Antarctic Science (Fiction?) Disaster

Watts Up With That?

Readers may recall the announcement of the PR for the recent paper claiming Sea-Level rise from Antarctic ice sheet could double in WUWT. In a tongue and cheek way, I prefaced it with “Oh Noes!” due to the ridiculous claims being made from model output. I wasn’t the only one seeing this paper as flawed. It’s actually worse than we thought.

Antarctic-NYT-pollard

Guest essay by Patrick J. Michaels and  Paul C. “Chip” Knappenberger, Center for the Study of Science, Cato Institute

There’s one thing that climate scientists of all stripes and flavors agree would be an unmitigated disaster: A sudden and dramatic melting of land ice, raising sea levels ten feet or so in a century.

Three years ago, it appeared that this monster had been put to bed by Denmark’s Dorthe Dahl-Jensen, when her team drilled all the way down through the ice to Greenland’s bedrock, providing the first reliable data from…

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