• Latest from the CCNF Community:

    • What Is Business As Usual?
      John Nielsen-Gammon

      What Is Business As Usual?

      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 as usual” for the purposes of estimating the consequences of taking no mitigating action against climate change. Back in January, fellow CCNF columnist and Texas A&M University colleague Andrew Dessler... Continue Reading...

    • Teaching Climate Change through Six Questions
      Jeremy Shakun

      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 used for teaching, which might be helpful to others. One of the key things to keep in mind is that there are actually several distinct questions surrounding global warming, even... Continue Reading...

      Andreas Schmittner


      Global surface temperature (anomaly from 1960-1990 average) reconstructions for the past 9000 years (Marcott et al. 2013), for the past 2,000 years (PAGES 2k), and observed for the past 150 years (Instrumental data from HadCRUT4) and the last 30 years (star). From Kaufman et al. (2013). Recently a german taxi driver asked me if climate hasn't been changing in the past with similar warm periods as the one we have now. After getting back home to... Continue Reading...

      Bart Verheggen


      After a bit of “hiatus”, ClimateDialogue (CD) has re-opened again with a discussion on climate sensitivity. On one hand this site is unique in bringing together ‘mainstreamers’ and ‘contrarians’ (both in the organization and in the discussions), hopefully leading to both enhanced clarity on what the (dis)agreements are really about and to decreased polarization. On the other hand it’s controversial because a ‘false balance’ is embedded in its structure (by purposefully inviting contrarian scientists to the discussion, rather than e.g.... Continue Reading...

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