NOT SO GREEN  |  Edmonds in the Dark

By steven d keeler | Dec 09, 2015
Source: Dr Curry

 

The  IPCC  consensus  about  dangerous  anthropogenic  climate  change  is  portrayed as nearly total among scientists with prominence in the field of climate science, and the IPCC consensus has been endorsed by the supposedly relevant national and international science academies and scientific societies

 

STATEMENT TO THE SUBCOMMITTEE ON SPACE, SCIENCE AND COMPETITIVENESS OF THE UNITED STATES SENATE

Hearing on “ Data or Dogma ? Promoting Open Inquiry in the Debate Over the Magnitude of Human Impact on Climate Change "

8 December 2015
Judith A. Curry
Georgia Institute of Technology



Unsettled climate science Anthropogenic  " climate  change "  is  a  theory  in  which  the  basic  mechanism  is  well  understood,  but whose magnitude is  highly  uncertain  owing  to  feedback  processes. Scientists  agree  that  surface  temperatures have  increased overall since  1880,  humans  are  adding  carbon  dioxide  to  the  atmosphere,  and  carbon dioxid and other greenhouse gases have a warming effect on the planet. However there is considerable disagreement  about  the  most  consequential  issues: whether  the warming has  been  dominated  by  human causes versus  natural  variability, how  much  the  planet  will  warm  in  the  21stcentury,  and  whether warming is ‘ dangerous ’.
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Why  do  climate  scientists  disagree ? The  historical  data  is sparse and  inadequate. There  is  disagreement about  the  value  of  different  classes  of  evidence,  notably  the  value  of  global  climate  models. There  is disagreement  about  the  appropriate  logical  framework  for  linking  and  assessing  the  evidence  in  this complex problem.  Scientists disagree over assessments of areas of ambiguity and ignorance. And finally, belief polarization resulting from politicization of the science and the IPCC’s consensus building process contributes substantially to the disagreement among scientists.

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