Making sense of Antarctic sea ice changes

December 9, 2014 1:13 pm10 comments
Making sense of Antarctic sea ice changes

Antarctic sea ice is one of those things in the climate system that seems to confuse people. Antarctic sea ice, on average, is increasing. How can there be global warming if sea ice is increasing in the Antarctic? Some have gone so far as to average the Arctic sea ice […]

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Uncertainty doesn’t imply nothing is known or nothing should be done

October 17, 2014 3:39 pm3 comments
Climate Forcing and Climate Sensitivity with ranges of Lewis and Crok paper and IPCC AR5

While Judith Curry brings up some interesting notions in ‘Climate Sensitivity Uncertainy‘, I don’t agree with many of her arguments and conclusions. I’m pleased that Dr. Curry acknowledges that “uncertainty in itself is not a reason for inaction” (see also ‘Why Climate Uncertainty is No Excuse for Doing Nothing‘ on […]

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Climate Sensitivity Uncertainty

October 3, 2014 7:20 pm3 comments
Nic Lewis and Judith Curry graph on ECS and TCR results from recent paper in Climate Dynamics

In a press conference ahead of the UN Climate Summit two week ago, UN Secretary-General Ban-Ki Moon stated: “Action on climate change is urgent.  The more we delay, the more we will pay in lives and in money.” The recently appointed UN Messenger of Peace Leonardo DiCaprio stated “The debate is over. […]

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Fears of Freezing: The 1970s are calling; They want their climate policies back

August 26, 2014 12:13 pm3 comments
Headline from The Melbourne, Feb. 18, 1979.

A top economic advisor to the Australian Government recently suggested in an op-ed published by the national daily The Australian that one scenario we should be prepared for is global cooling due to a possible change in solar activity. Certain reports in the U.S. media have also suggested cooling may already be upon us because […]

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What Is Business As Usual?

August 20, 2014 5:15 pm0 comments
Comparison of CMIP5 results and MAGICC output for global temperature increase.  Note that temperature increase is presented relatively to the 1986-2005 average in this figure.  From AR5 WGIII, Chapter 6 final draft.

This post examines the scenarios and pathways used over the years by the Intergovernmental Panel on Climate Change (IPCC) to represent possible future emissions, atmospheric concentrations, and temperature changes. In particular, it seeks to determine which, if any, of the current Representative Concentration Pathways (RCPs) can be regarded as “business […]

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Teaching Climate Change through Six Questions

August 12, 2014 3:47 pm5 comments
Teaching Climate Change through Six Questions

Given all the back and forth on climate change out there, it can be hard to know what to think. It’s also a complicated subject, so much of the information is distributed all over the place or in huge tomes. Below I’ve put together a fairly quick overview that I’ve […]

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