In the blue corner, Andrew Bolt:
Why are people who’d have been communists a generation ago almost certain to preach global warming alarmism today? What makes the new faith so tempting?
In the, ahem, ‘red’ corner, Professor David Karoly:
Recently, there has been an increase in opinion pieces in the media questioning the scientific understanding of global warming. This is not reflected in a surge of scientific publications suggesting that increasing greenhouse gases are not the cause of recent global warming. Instead, the vast majority of scientific studies support and strengthen this conclusion.
I do not know the reason for this increase in media coverage of so-called “global warming sceptics”, where a common trend is to select a small amount of information to give credit to a misleading conclusion. Whatever the agenda, they have a number of common statements.
In summary, let me emphasise that the pattern and magnitude of observed global-scale temperature changes since the mid-20th century cannot be explained by natural climate variability, are consistent with the response to increasing greenhouse gases, and are not consistent with the responses to other factors. Hence, it is very likely that increasing greenhouse gases are the main cause of the recent observed global-scale warming.