THE Copenhagen climate change summit closed two weeks ago in confusion, disagreement and, for some, disillusionment. When the political process shows such a lack of unanimity, it is pertinent to ask whether the science behind the politics is as settled as some participants maintain.
Earlier this month (The Australian, December 9) I commented
on recently published results showing huge swings in atmospheric carbon dioxide, both up and down, at a time of global cooling 33.6 million years ago.
Paul Pearson and co-authors in a letter
(The Weekend Australian, December 11) took exception to my use of their data and claimed I misrepresented their research, a claim I reject since I quoted their data (the veracity of which they do not contest) but offered an alternative hypothesis, namely that the present global warming theory (which was not the subject of their study) is inconsistent with the CO2-temperature variations of a past age.